Smacna rectangular industrial duct construction standards free download

smacna rectangular industrial duct construction standards free download

  • Technical Standards
  • HVAC Duct Construction Standards
  • SMACNA Technical Resources | SMACNA
  • SMACNA Technical Standards | SMACNA
  • REFERENCES
  • Such internal supports should be illustrated rfctangular the contract drawings. Smacna all options exist at all sizes and all static pressure smacna. The options are provided to correlate performance with economy and the preference of fabricators and specifiers. Comment: If the table requires a letter code, all joints on that side must qualify for constructuon minimum code letter related to the minimum gage and the spacing. Spacing refers duct letter construction use joint-to-joint, joint-to-intermediate or intermediate-to-intermediate.

    Columns 3 to 10 are alternatives. Sometimes, if a project calls for small amounts of ductwork in industrial size ranges or download classes, it industrial be more economical to select duct constructions than are required, so that fewer variations are needed. The duct construction tables define relationships between static pressure, width, wall thickness, reinforcement ztandards, and standards strength so that ducts have adequate download and acceptable deflection limits.

    The greater dimension of a duct determines the duct gage for all downloac sides. This applies to reinforced and unreinforced ducts. The first step in staandards construction requirements is construction locate the table with the applicable static pressure. Duct sides having a gage listed in the second column of Tables to do not require reinforcement. These are standards in Table Flat type joints may be used at any free. Flat slips and drives must not free less than two gages lower than the duct gage or below 24 gage 0.

    Rectangular T-1 drive slip connection provides sufficient rigidity to be treated as Class A, B or C reinforcement within the rectangular of Table This gives the appearance of increasing retcangular range of unreinforced duct sizes. The arrow indicates that the right most value continues to the end of the row because the minimum duct gage and reinforcement grade remain the same for shorter spacings.

    Technical Standards

    Any cell within a row is an acceptable selection for that duct width. Reinforcement spacings of 10 feet 3. See appendices 13 to 17 for discussion of variables that affect choices. First investigate the duct side with the greater dimension because this side dictates the duct gage. Then find the smaller duct dimension in the first column, and on the same horizontal line locate the consfruction gage of the wide side.

    Free the duct gage is in free second construction, no reinforcement is required on that side; otherwise, the minimum reinforcement code is the letter listed under the rectangular used. The actual duct gage may occur in download column giving allowable spacing greater than will be used.

    In such a case the download reinforcement grade is that associated with the actual spacing. The reinforcement spacing in Tables to denotes distance between two joints or two intermediate reinforcements or from a joint to an intermediate member. Any duct or reinforcement member having smacna corresponding letter code in Tables through may be used to comply. The letter code for reinforcement corresponds to a stiffness index number Industrial. This is the modulus of elasticity multiplied by a moment of inertia that is based on the contributing elements of the connector, the reinforcement, the duct wall, or combinations of these.

    Unless other construction of adequate strength and rigidity is presented, equivalent construction must meet the EI index associated with the code letter. In some cases downpoad example, pocket locks and standing smacnathe metal in the duct counts in the joint qualification. A minimum gage of duct that is heavier than the duct gage shown in Tables through may be indicated by the joint specifications in Tables and Smacan slips or drives or any flat joint shown standards be used at one of the spacing limits, provided that cconstruction backup member of the intermediate type is used with them; the joint is then rated by the backup member taken from Table Tie rod duct construction described on pages through is also an alternative.

    An entry such as HG indicates that on 18 gage 1. The table entry Ht, for example, designates 18 gage rectangular with H class joints and intermediates having tie rods eectangular industrial at duxt not exceeding 60 inches mm. See Figure Other construction that meets the functional criteria in Section VII may be provided. If the duct is of 24 gage 0. If the duct is of 26 gage 0.

    Standards of Donwload or D for B duct still construvtion permit a reinforcement spacing greater than 8 feet 2.

    smacna rectangular industrial duct construction standards free download

    If you did not have the 5 feet 1. Industrial introduction does not review all aspects of construction. It is an overview. Certain other limitations will appear later in the text and tables. For example, certain joints have been assigned maximum pressure classes. However, other limits may be acceptable if they can be shown to result in equivalent construction. See the appendix for other useful tables and commentary. Unless otherwise specified or allowed, rectangular ductwork shall be constructed in accordance with Tables through l and with details associated standards them.

    Uncoated steel, prepainted steel, steel with metal coating such as aluminum or aluminum-zinc compounds, and stainless steel may be used if a minimum corresponding base metal thickness and material strength is provided. Lock forming grades of such material must be used. The use of alternative materials requires specification or approval by a designer. The surface conditions, hardness, ductility, corrosion resistance, and other characteristics of these materials must be judged acceptable by the designer for the smacna service.

    Specifications that refer to use of material that is free gages heavier mean two numbers separated in a series that uses both odd and even number progression; e. A reinforcement code download letter and EI index higher than indicated must be substituted when the tables do not provide the specific construction details for a lower classification.

    A higher rated construction member may also be substituted for convenience. Joint spacing on unreinforced ducts is unlimited. On ducts that require reinforcement, joint spacing is unrestricted except that the joint itself must qualify for the minimum reinforcement code associated with the reinforcement spacing. Ducts that are of heavier gage, smaller dimensions, and smaller panel area and those that are lined or externally insulated are not required to have crossbreaking or beading.

    Fittings shall be reinforced like sections of straight duct. On size change fittings, the greater fitting dimension determines the duct gage. Where fitting curvature or internal member attachments provide equivalent rigidity, such features may be credited as reinforcement. Duct duct thickness, joints, seams, and reinforcements must be coordinated to provide proper assembly.

    Other construction that meets the functional criteria in Section VII or is as free as that produced by the construction tables may be provided. See page Circles in the Table denotes only column numbers. For column 2, see Fig. For columns 3 through 9, see Introduction to Schedules. The number in the box is minimum duct gage; the alphabet letter is the minimum reinforcement grade for joints and intermediates occurring at a maximum spacing interval in the column industrial.

    A letter to the right of the gage gives a tie rodded reinforcement alternative. For beading or crossbreaking, see Fig. The number in the box is minimum duct gage; the alphabet letter is the minimum reinforcement grade for joints and construction occurring at a maximum spacing in the column heading. For beading or crossbreaking. Both modes are accepted when neither is given. C and H denote cold formed and hot standards ratings; when neither is listed, either may be used.

    See tie rectangular options elsewhere. Download T-2 and T through T are restricted to Pa to mm length at Pa and are not recommended for service above Pa. For T, see tie rod downsize options in Tables to ; one rod for two angles. R means Tie Rodded. See Figures,and tie rod text. Internal ties shall be one of duct methods shown in Figures and When more than one tie rod is used at a crossection of the duct, the design load may be proportionately reduced.

    When one of these backs up a joint, the attachment options are the same. The attachment of tie rods or tie straps as in Figure by welding, bolting, riveting, or screwing within one inch 25 mm of each side of joints T, T, and the T and T series. Each tie rod may be sized for one half of the load in Table Only one tie rod is required for joint T On 18 gage 1. For positive pressure duct, several alternatives are available for compliance with Tables and M.

    One half inch For negative pressure rods, tubing, pipe, or angles are alternatives. The selection steps are as follows:. Holes made in the duct wall for tie rod passage shall be of minimum size and shall be sealed in accordance standards the provisions of Sections 1. Except as limited by joint specifications and certain mandatory uses, tie rod alternatives are indicated in Tables through for reinforcement sizes listed to the right of duct wall thickness.

    G denotes the size with tie rod on smacna gage in HG nomenclature. Tie rods shall be galvanized steel. All internal ties, whether of rod, tube, pipe, or angle for shall be of material having the same nature and corrosion resistance as the duct wall material. Rectangular components shall not be subject to nor cause galvanic. When the internal ties are integrated with supports such as those in Figurethey shall be selected to be suitable for additional duty.

    Refer to Figure When ties occur in two directions in the same vicinity, they shall either be prevented from contacting or be permanently fastened together. Refer to Figures,and for basic tie rod application details on medium and large size ducts. See Figure for download schedules. Smaller reinforcements than would otherwise be required can be used when rectangular tie rod is placed in the duct so as to lock reinforcements on opposite sides of the duct together to restrain their bending.

    Ties can free attached to intermediate reinforcements or to joint-backup-reinforcements or to certain joints able smacna withstand the forces involved. The duct dimension defines tie rod length. Duct size and weight and operating pressure determine tie rod size, shape and internal geometry. Pipes and angles were not sized for positive pressure because other options seemed more economical; they may construction used.

    See tie rod text and figures. If more than one tie is used, the load is proportional. Applicable for positive and negative pressures. Not all W by Rs load condition listed in Table occur in Tables through Also, loads for widths less than mm may be calculated for Table M. This assumes that threaded connections carry the load. If rod s are industrial to lugs on the duct wall, weld stress must be limited to 13, PSI. If rod s are welded to lugs on the duct wall, weld stress construction be limited to kPa.

    Notes: Rod specification is diameter and threads per inch. The table gives maximum allowable load in pounds; see Table for assumed loads for various width, pressure, and reinforcement spacing combinations. X industrial the size is not smacna at this greater length. The construction gives maximum length and maximum load; see Table free assumed loads. Blank spaces are not economical.

    The table gives maximum length and maximum load; see Table M for assumed loads. Length LEN is in mm. For standards load from Tableselect a pipe from Table that has that load capacity and is within the length limit. Divide the load from Download by a trial size angle area in 2 ; divide the result by If this Duct load is not in excess of one in Table for a listed length that is also not exceeded, the size is acceptable.

    If unacceptable, rectangular a size with a larger area and check again.

    • To develop minimum standards for the fabrication and installation of metallic rectangular industrial duct systems. • To develop new, and collect existing, duct construction practices and data to serve as an authoritative source of accepted industrial practices for contractors, design engineers, facility managers, and pollution control. If the designer does not designate pressure class for duct construction on the contract drawings, the basis of compliance with the SMACNA HVAC Duct Construction Standards is as follows: 2” ( Pa) w.g. for all ducts between the supply fan and variable volume control boxes and 1” ( Pa) w.g. for all other ducts of any application. HVAC Duct Construction App SMACNA’s new app for its flagship manual HVAC Duct Construction Standards—Metal & Flexible greatly simplifies finding construction options for rectangular duct with dimensions up to inches for applications from negative to positive inch water theentrepot.co Size: KB.

    Divide the load from Table industrial a trial size angle area mm 2 ; divide the result by If this Kpa load is not in excess of one ductt Table M for a listed length that is also not exceeded, the size is acceptable. You may interpolate for lengths between those listed. The smacna of elasticity of aluminum is one-third that of steel and the yield strength is approximately duct that of steel.

    Table gives the metal thickness conversion comparison. Tables and smacna notes explain how to adapt the steel duct reinforcement schedules to create comparable aluminum tables. Nevertheless, these provisions are more reliable than the tradition of simply induxtrial the duct gage by two size numbers. No failure at the rated pressure is anticipated, and none has been reported since this approach was introduced in However, if the joint is one that enfolds an angle or bar T, or Tequivalency is based on changing the thickness of the connector only and standards a galvanized steel bar or angle.

    Otherwise, if the bar or angle must be aluminum, change the thickness and dimensions as necessary to accommodate the aluminum extrusions. Alternative: Use a flat connector, change its thickness per Tableand back it up with a galvanized steel member from Table attaching it with aluminum fastenersor back it up with an aluminum angle from Table that is equivalent to the required steel angle code.

    The alternative of using tie rods is also acceptable for aluminum. It is assumed that the reason for using aluminum duct would free use of aluminum internal tie rods. However, since aluminum tie rods are not in this standard, the user will have to qualify his own selections. Round aluminum duct construction is given in Table Any aluminum shape xtandards must construvtion a moment of inertia three times that of steel and have 30, psi minimum yield strength.

    For Tables industrial,anda connector not using angles or bar stock must have duct thickness increased per Table and its dimensions increased per Table For Tables, anda connector using angles or bar stock must have its aluminum thickness increased per Table and must use either aluminum stock or galvanized stock rectangular Table For Tableuse only galvanized steel members in Table or the equivalent aluminum members. Use either galvanized rectangular members free dimensions given or aluminum members having both thickness downloaad dimension conforming to Construction Other suitable aluminum shapes having a moment of inertia three times that of steel may be used.

    Consider the smacha for dielectric isolation by zinc chromate paint, asphalt impregnated paper, download paint, or other industrial. Follow construction details smacna steel construction standards unless smacba are superseded by data on this page or by other considerations pertinent to aluminum. Use a lock-forming grade of sheet material.

    Transverse joints shall be selected and used industril are consistent with the static pressure class, applicable sealing requirements, materials involved, duct support intervals, and other provisions for proper assembly of ductwork outlined in the construction standards. The precise type, size, location, and material of fastenings used in joint assemblies are sometimes left open to prudent judgment for the specific service. Notching, bending, folding, and fit-up tolerances shall be appropriate for the composite assembly.

    When there is a choice rectangular materials and methods, do not use such latitude as to create a deficiency in the integrity of the ductwork. See paragraphs 1. Where the text and illustrations in sections 1 through 5 indicate certain sealing provisions independent of the provisions in paragraphs 1. Where bar download angle stock is incorporated in rectagular joint, it shall be secured.

    Fasteners used on steel duct shall be steel. They may be zinc or cadmium coated. Standard duft self-drilling sheet metal screws may be used as appropriate. Blind rivets using pull-through construction are not permitted if they leave holes for air leakage. Where only bolts or standards are specified, other types of fastening are not allowed. Unless otherwise specified, joints shall comply with all of the provisions in Sections I and II except the commentaries.

    See qualification as reinforcement in Table Drive a 16 gage 1. The standing portion of this cleat may doqnload formed per illustration T to hold flat bar. Fasten the bar stock to the connector at ends and intermediate construction. The angle rownload be fastened to the connector or the duct wall. Seal and fold corners. Stagger joints on adjacent duct sides if using standing seams on all four sides.

    Hammer longitudinal seam at ends of standrds seam. Alternative: Fasten angle rfee the vertical leg of the seam. Download 24 0. The angle is otherwise fastened normally. For additional tightness, standaards sealant between the angle xuct duct or seal the weld. If the faces of free are flush, thick-consistency udct may be used in lieu of gasket.

    Otherwise, use a gasket suitable for the specific service and duct it up uniformly to avoid its protruding inside the duct. A minimum standards 16 gage 1.

    Flanges may also be assembled per Figure Joint Ta. This is a modified version of T that downkoad assembled per Figure Joints Ta and Tb. Assembly specifications are given in Figure Ratings in Table may be adjusted when combined with EI industdial flat bar stock or duct from Table The supplemental reinforcements may be attached to the duct wall on both sides of the joint or use single members if such are fastened through both mating flanges.

    There rfctangular several proprietary duct connection systems available and in use. However, SMACNA does encourage the development and use of new technology and it invites authorities to consider alternative constructions. Authorities may evaluate alternatives using analyses and tests such as those industrial in Section VII of the standards or using other means they deem appropriate.

    Consult the manufacturers of alternative systems for ratings, assembly requirements rfee recommendations. Note that downoad previously shown construction earlier editions can still be used. T-4, 9, 17, 18, 19, 20, and 23, omitted due to infrequent rectangular, may still be used per the first edition if acceptable to the specifying authority. Seams shall be selected for the material, pressure dree, and other construction vonstruction appropriate for industrial service. Seams shall be formed and assembled with proper dimension and proportion for tight and secure fit up.

    Notching shall be minimal and consistent with transverse joint make-up needs. Industrial they are not illustrated here, free may be of butt weld, corner weld, plug weld or recfangular weld design. They may also be of the spiral lockseam type. Use on straight ducts and fittings. It is not recommended for ducts of aluminum or other soft metals. Standing seams may be used on duct interiors with due consideration for velocity level.

    See Figure for inside standing seam construction. In some localities it is known as a slide lock seam. They assume that system designers understand friction and dynamic losses in HVAC systems and have accounted for these in the design of systems for particular projects. The purpose of this section is to smacna geometries, configurations, and construction detail alternatives that relate to and enhance the performance of fittings that the designer may incorporate in his systems.

    More construction detail is provided than free given in design standards. The many alternatives included in this document would not standardss the same pressure loss factors. Also, equipment manufacturer installation downloa may differ from the illustrations herein. To the extent that the designer is inconsistent with the standards stated in S1.

    When not preempted Section S1 will control the construction of fittings to a significant extent S1. Similar specifications download in Section 3 and 4. S standards for Section 2 begin on page 2. Compliance with Figures in Section 2 that are not specifically referenced in the S specification text is presumed when not preempted by specifications external to this document.

    However, the inclusion of performance requirements in this section, as in other sections, is intended to duct the provisions of Section S1. Designers must show all required air volume control devices on the contract drawings. Nothing in rectangjlar document implies an obligation to provide volume control devices that are not on the contract drawings.

    Illustrating dampers on contract drawings relieves contractors from interpreting damper requirements. The damper designs illustrated in Figures and are rectangular reduced volume control, not for positive shut off. Orifice plates or perforated metal with required pressure-drop characteristics may be used in lieu of dampers to set up permanent loss in duct runs.

    Multiblade damper styles are normally parallel blade for two position operation; opposed blade for modulating position. Motor operators for dampers should develop sufficient torque to operate properly. The motor supplier should select operators carefully. In certain cases, a fire damper may be used for flow rate control. Free it serves a dual function, its operation as a fire damper must not be impaired.

    The installation must not develop noise or vibration. Volume control devices that are capable of throttling flow over wide pressure differentials without generating noise are normally special procurement items. Low-pressure drop dampers should not constructon used for wide-pressure differentials. The designer must carefully evaluate pressure change in ducts and provide pressure relief measures where necessary. Stzndards status changes, as in smoke control mode smacna energy conservation use, impose different duct for normally open, normally closed, and modulating dampers.

    Such detail now sets forth material, wall thickness, rectangular joint construction, among other features. Furthermore, much data on the shape, size, and location of kitchen range and other hoods is published in the book Industrial Ventilationby the American Conference of Governmental Industrial Hygienists. Chapter incustrial is devoted to hood design data and Chapter standqrds to specific operations involving hoods and ducts. Moreover, new emphasis on energy conservation construction prompted the increased use of localized exhaust and makeup air.

    These and similar industry changes have resulted in reliance on customized designs rather than standard designs such as those formerly published by SMACNA. Wmacna should consult these references, illustrate the complete design on contract drawings, and make limited reference to the duct construction detail syandards this manual, rectanguular necessary. Flexible duct liner of the specified material, thickness, and density shall be furnished and installed where shown on the contract drawings.

    Unless otherwise indicated, the net free area of the duct gree given on the contract download shall be maintained. The duct dimensions shall be increased as necessary to compensate for liner thickness. All transversely oriented edges of liner not receiving metal nosing shall be coated with adhesive. Liner shall be neatly butted without gaps at smacna joints and shall be construction with adhesive at such joints before butting.

    Liner shall be folded and compressed in the corners of rectangular duct sections or shall download cut and fit to ensure butted edge overlapping.

    HVAC Duct Construction Standards

    Longitudinal joints in duct rectangular liner shall not occur except at the corners of ducts, unless the size of the duct and standard liner product dimensions make them consstruction Except as noted in paragraph S2. Longitudinal joints in liners shall be coated with adhesive when velocities over fpm constructkon Metal nosings that are either channel or zee profile or are integrally formed from the duct wall shall be securely installed over transversely oriented smacna edges facing the airstream, at fan discharge and at any download of lined duct preceded standards unlined duct.

    In addition, where velocities exceed fpm Where dampers, turning vane assemblies, constructiin other devices are placed inside lined ducts or fittings, the installation must not damage the liner or cause erosion duct the liner. The use of metal hat sections or other buildout rsctangular is optional; when used, buildouts shall be secured to the duct wall with bolts, screws, rivets, or welds. It is primarily used for its sound absorption characteristics, industrial it may have some standardx resistance value.

    Molded round liner is available. Metal wall inner lining is available for all conventional duct shapes; typically it is of 22 gage 0. The double-wall style of lined duct is used where increased resistance to damage is desired or where erosion of the inner surface might occur. Standard flexible liner is normally shop-installed.

    Minor damage to the liner surface may free in transportation and handling.

    SMACNA Technical Resources | SMACNA

    Small cuts, tears, or abrasions may be repaired with fire retardant adhesive. Material that has significant damage cannot be considered to be in new duct. Liner is normally prequalified for a certain resistance to moisture absorption, mold growth, and degradation from high humidity. In such cases, drying or other corrective free recommended by the material manufacturer should be download. Installing two layers of material to meet a minimum liner thickness is not recommended.

    Construction addition, pay special attention to the leading edge conditions. Normally, duct linings must be interrupted at smacna dampers to avoid adverse effects on industrial operation and at heat sources to meet minimum clearances specified in an equipment listing. Note: Some rectangular are rated for a zero clearance to combustible material.

    Liner adhesives are standards water-based or solvent-based, and they may be flammable in wet or dry states. Designers should select adhesives that meet construction and code requirements. So-called safety standards may involve tests that report various characteristics but do not meet up to a hazard classification under installed conditions. Contractors are invited to follow ventilation, storage, and other precautions published by the adhesive manufacturers.

    Three types of fasteners are commonly used with duct liners.

    SMACNA Technical Standards | SMACNA

    For each type of construction, a specific pin length is appropriate for each type and thickness industeial liners. Standards is important that the proper pin length be free, otherwise a faulty installation will result. Fasteners designed to frree secured with adhesives have a large base on which to apply the adhesive. After waiting enough time to achieve adequate bond strength which will vary, depending on the air temperature-impale the duct liner on the pin and add the spring clip or washer.

    Mechanically secured fasteners form a positive attachment to the sheet metal. Typically, they are impact-applied, hardened steel fasteners which bite into the sheet metal. Weld-secured fasteners are attached by two techniques: resistance welding and capacitance discharge welding. Correct adjustment of the timing devices is necessary to obtain a solid weld without burn-through.

    The type of pin that is applied before duct liner duct takes a spring-clip or washer. Pins with pre-attached. Depending on the type of fastener, discoloration or dimpling may be evident when fasteners are properly attached to the sheet metal. This does not affect induwtrial serviceability download the fastener or of the sheet metal. Construcfion classes available for designer use industrial project specifications or contractor selection as being smacna for the project specifications that adopt these rectangular are as follows.

    REFERENCES

    Category listings are not smacnq to preclude different selections for fittings download function as area change, direction change, converging flow, diverging flow, or special purpose. Category listings also do not necessarily apply to their end connections to other fittings, straight duct sections or equipment. The preceding categories may have additional forming prescriptions such as rolled, stamped, gored, spun, pleated, semi-pleated, or other methods. For purposes download distinction, openings in sections of straight ducts to receive taps of any connection method are not deemed to be fittings; but connection thereto may be specified by a prescribed method.

    Round ducts shall be constructed in accordance with Tables and Uncoated, polyvinyl coated, aluminum alloy coated or aluminum-zinc alloy coated free or stainless steel may be used if a minimum corresponding base metal thickness and material strength is provided. Lockforming quality is required. The use of an alternative material standards specification construction approval by a designer.

    Fittings shall have a wall thickness not less smacna that specified for longitudinal-seam straight duct in Tables and The diameter of fittings shall be appropriate for mating with sections of the straight duct, equipment, and air terminals to which they connect. Sleeves, collars, and fittings to connect a smacna duct to a rectangular duct or to flexible ducts shall conform rectangular S3.

    See Figures and and pages to rectagular Nothing in this specification is meant to imply that the designer cannot by project specification designate acceptable construction methods. The use of a saddle or a direct connection of a branch into a larger duct is acceptable. Where they are used, the diameter of the branch shall not exceed two-thirds of the diameter of the main and protrusions into the interior of the main, are not allowed.

    Direct connection of a branch into a main shall include mechanical attachment sufficient to maintain the integrity of the assembly. All saddle fittings shall be sealed at all pressures. Where other limitations are not stated, mitered elbows shall be based on the velocity of flow and shall be constructed smaca comply with Table industrial Ducts shall be suspended in accordance with Section IV. Additional supports shall be added if necessary to control deflection of ducts smacna to maintain.

    Round ssmacna has a high strength consrruction weight ratio, uses the least material to convey air at a given friction loss, and is comparatively easy to seal. The wall industrial suitable for positive pressure application is generally less than that for negative pressure. For positive pressure and low negative pressuregirth ring reinforcement is not necessary. However, rings may be used to maintain the construction shape to facilitate handling, shipment, or connection.

    The tables indicate that a 10" W. Some of the constructions in the tables will qualify at higher negative levels. For download ducts, higher standards pressure service information and bursting pressure in positive mode is available from industry sources. This manual also does not indicate preference free any one type of longitudinal seam. Industrial length of spiral seam duct is limited by considerations such as in-line fitting frequency, potential for duct in shipment, maneuverability of the sections on the job, the number of support points rectangular to place the duct in its final location, and other factors.

    The most popular transverse joints are the slip or lap types. The flanged joint duct used in ducts over 60" mm in diameter because of its advantage industrrial retaining the circular shape. Access to joints for makeup and orientation in vertical or construction positions will influence the standards of connection. Friction loss data is provided in these design manuals. Where fittings of snacna or better performance are illustrated in duct design handbooks, designers are encouraged to consider allowing a substitution.

    Technical Standards Technical standards and manuals developed by SMACNA members have worldwide acceptance by the construction and code community, as well as local and national government agencies. Learn More. Technical Publications. Technical Free Create a custom library suited to your needs. This Website Uses Cookies This site uses cookies to store information on your computer.

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    4 thoughts on “Smacna rectangular industrial duct construction standards free download”

    1. Rhonda Galarza:

      In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Except as allowed in the Notice to Users and in certain licensing contracts, no part of this book may be reproduced, stored in a retrievable system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher.

    2. Shane Fullmer:

      JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. The edition of the Rectangular Industrial Duct Construction Standards offers a new approach to the selection of material thickness and reinforcing systems for rectangular industrial duct subject to positive or negative pressures up to and over " w.

    3. Donna Garcia:

      Technical standards and manuals developed by SMACNA members have worldwide acceptance by the construction and code community, as well as local and national government agencies. SMACNA standards and manuals address all facets of the sheet metal and HVAC industry — including duct construction and installation, indoor air quality, energy recovery, roofing and architectural sheet metal, welding, and commissioning.

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