A rigid straight cross-member or other appropriate means of determining zero pressure deflections for the flat spans must be provided.The laboratory may just report its findings or may certify that compliance with a particular standard or requirement has been met.Flexible isolation connectors shall not exceed 10 inches in length in direction of airflow and shall be made of flame retardant fabric fabric having a flame spread rating not over 25 and a smoke developed rating not over 50.FIG. Set up the dial indicator(s) over the test point(s). 4-4 LOWER HANGER ATTACHMENTSFIG.

Record the proceedings and observations. 3-10 FLEXIBLE DUCT SUPPORTSFIG.

Hangers in contact with the duct shall be galvanized steel or aluminum.Ducts in Concrete Slabs or Under SlabsConstruction tables are prepared in “narrow scope” for 2" water gage and 1" water gage pressure classifications.

Attach supports with a minimum number of duct penetrations.The table is based on 48" width coil and sheet stock. 60" stock has the same tolerance for gages listed except for 16 gage which has ± 0.007" in hot rolled sheet.10. Riser support intervals should be at one or two story intervals, i.e., 12 feet (3.66 m) to 24 feet (7.32 m), as suitable for loading. In order to prevent the forces on the casing walls from shearing off the curb, the curb should be securely doweled to the floor. In the event that the petitioner has a substantive disagreement with the interpretation, an appeal may be filed with the Technical Resources Committee which has technical oversight responsibility. 104 pounds. (1000 Pa) static or less. When there is a choice of materials and methods, do not use such latitude as to create a deficiency in the integrity of the ductwork.To select the MPT of EMT, find in Table 1-18SM that 12.7 mm diameter EMT is adequate at 0.75 m RS up to 1168 mm length. 2-4 VANE SUPPORT IN ELBOWSConsult the applicable codes, the U.L. 1-2(G) or two rods per Fig. We ended up building the SMACNA tables for our needs. The manufacturer’s load ratings and application data should be followed for all devices and materials.13.

Regulations governing these forms of duct should be checked especially for floor penetrations, ceiling air plenums, and fire rated floor-ceiling or roof-ceiling assemblies.FIG.

The load can be transferred to the riser support by angles or by rods.Step 3.

Drive a 16 gage (1.61 mm) formed angle of 1″ (25 mm) height into the slip pocket and fasten with screws at the ends.

negative pressure with 4’ joint spacing and 2’ RS; use standing S or T-25 joints.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.3.4 Round Duct Deflection Limitsto evaluate circular or semi-circular portions of flanges or angle reinforcements.FIG. 1-12 DUCT OVER 120” (3048 mm) WIDEConstruction of aluminum duct and fittings shall otherwise correspond in the same relationship as for steel duct.Our study of noise radiation was conducted under less than ideal conditions. This applies to reinforced and unreinforced ducts.Consult NFPA Standard 90B and other codes and specifications applicable for use of materials thinner than 26 gage (0.55 mm) in residential work.MFMA—Metal Framing Manufacturers AssociationThe provisions for sealing ducts specified on page 1-8 apply.

Certain manufactured devices that are driven onto the flange will support either a rod or a band type hanger.The letter code for reinforcement corresponds to a stiffness index number (EI).

Assembly specifications are given in Figure 1-15. This thickness is correct for external reinforcements as well as for midpanel tie rod (MPT) cases. SMACNA discourages the practice of providing excess length in case of future building modifications.For a clear interpretation of requirements for ducts and for economical attainment of performance objectives, it is ESSENTIAL THAT CONTRACT PLANS IDENTIFY THE PORTION OF EACH DUCT SYSTEM TO BE CONSTRUCTED FOR A PARTICULAR PRESSURE CLASSIFICATION OR THAT THE ENTIRE SYSTEM BE ASSIGNED A PRESSURE CLASSIFICATION.Sheet lead is not structurally self-supporting, so must be mounted to prevent sagging by its own weight.

One half inch (12.7 mm) RC conduit may be used.

The choice of open cell or closed cell rubber gaskets depends on the amount and frequency of compression and on the elastic memory.W is width. They are generally known as the peel and seal variety and have been used between flanges and on the exterior of ducts.

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