Designers must specify constructions appropriate for the specific locality and circumstances.ASTM 553—Mineral Fiber Blanket and Felt Insulation (Moisture Absorption)The choices for the 30” (762 mm) side are: 16 ga (1.61 mm) for unreinforced; E on 22 ga (0.85 mm) at 10 feet (3 m); D on 24 ga (0.70 mm) at 8 feet (2.4 m), or D on 26 ga (0.55 mm) at 6 feet (1.8 m) max.
Nonexclusive, royalty-free permission is granted to government and private sector .. This gage is correct for external reinforcements as well as for midpanel tie rod (MPT) cases. Sections S3.23 and S3.24 contain statements that ducts “should” have minimum length and “should not” be compressed. 4-7 RISER SUPPORTS - FROM FLOORADC Flexible Duct Performance & Installation StandardsThe duct contractor shall provide:FIG. For spiral ducts, higher negative pressure service information (and bursting pressure in positive mode) is available from industry sources.Designers should carefully consider the proximity of intakes to exhausts and the possibility of drawing in contaminated air. With amplification available from the recording instruments, this value was the width of one line on the trace, which was equal to a movement of the sheet of .01785 in. Advice to consult the SMACNA HCVA Air Duct Leakage Test Manual was. manual (smacna): “where no specific duct pressure class designations are provided byclass designations are provided by the designer the 1” water gage pressure class is the basis of Both tables show that only one MPT tie rod is required on 54″ width.Flat slips or drives (or any flat joint shown) may be used at one of the spacing limits, provided that a backup member (of the intermediate type) is used with them; the joint is then rated by the backup member taken from Table 1-10.Some sealants can adversely affect the release function of breakaway connections to fire dampers; consult the damper manufacturer for installation restrictions.FIG. Where space is at a premium, particularly in modern buildings, and where utmost radiation protection is demanded, lead is invariably used. Where fitting curvature or internal member attachments provide equivalent rigidity, such features may be credited as reinforcement.Joint T-24a. Pressurize round and oval ducts 100% above the step 2 level for five minutes minimum. The Sheet Metal and Air Conditioning Contractors’ National Association and other contributors assume no responsibility and accept no liability for the application of the principles or techniques contained in this publication.
The restraining member and its connections shall be capable of sustaining a load equal to 75% of the duct construction pressure class load applied as 5.2 pounds per square foot per inch of water gage (101.63 Kg per square meter per kPa) over an area equal to the width of the duct times the reinforcement interval. 104 pounds. Not recommended for pressue over 4″ w.g. To the extent that the designer is inconsistent with the presumption stated in S1.3 on page 1.8, installers may assume that construction alternatives herein are left for their choice.The liner surface designated to be exposed shall face the airstream.NOTICE: Test procedures 3A and 3B may result in showing compliance with the performance criteria published by SMACNA, and not result in structural failure in the specimen. 2-15 CEILING DIFFUSER BRANCH DUCTS17. All of these form an integrated combination for each pressure class and duct size. The first pour should be the base support for the duct and anchors should be included. They must also handle bending moments so that allowable stresses are not exceeded.Longitudinal joints in liners shall be coated with adhesive when velocities over 2500 fpm (12.7 mps) are anticipated.Concrete fasteners are installed after the concrete has been poured and the forms have been removed. When ducts are acoustically lined, their dimensions shall be increased as necessary.Joint T-16, STANDING SEAM, ANGLE REINFORCED: Close seam per Joint T15 notes. 1-8 CROSSBROKEN AND BEADED DUCTFor each width of duct, the sheet gage, reinforcing size, and reinforcing spacing were varied in order to determine the lowest cost construction that would perform within the standards.Construction of aluminum duct and fittings shall otherwise correspond in the same relationship as for steel duct.Volume damper construction is provided on pages 2-15 and 2-16.HVAC DUCT CONSTRUCTION STANDARDS COMMITTEEPresent substantial evidence of historical acceptability for the use intended, and show that the previous use has been subjected to the pressures, velocity levels, and other conditions for which rating is desired.Fittings shall be reinforced like sections of straight duct. Flat slips and drives must not be less than two gages lower than the duct gage or below 24 gage (0.70 mm).Nominal Thickness in MillimetersExpanding concrete anchors should be made of steel. When more than one tie rod is used at a crossection of the duct, the design load may be proportionately reduced. FREE SMACNA MANUAL PDF. 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.Supports for ducts should be as indicated in Figure 5.4. They shall not be used for structural support of equipment.VAN STONE TYPE (with 3/8″ (9.5 mm) flange on duct). They may be zinc or cadmium coated.
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