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Crossing tie rods must comply with S 1. To the extent that the designer is inconsistent with the presumption stated in S1. If you did not have the 5 feet 1. The same gage of metal is used on all sides. Mastics must have excellent adhesion and elasticity. The lowest vibration in the system was obtained in the section of duct having the thinnest gage. Then it discharged into a plenum with an outlet damper.

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Hvac Duct Construction Manual

Insufficient support causing misalignment of duct sections Support detaching from duct assembly if attached Support deflecting under load, adversely affecting duct integrity or shape retention Support contact with duct being periodic and causing noise. This applies to reinforced and unreinforced ducts. If an area is near this equilibrium condition, then relatively small but rapid variations in static pressure caused by turbulence will make that area vibrate violently. Liner adhesives are usually water-based or solvent-based, and they may be flammable in wet or dry states. Some appliances are rated for a zero clearance to combustible material. Lead headed nails may be used as shown in Figure 5.

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Lead headed nails may be used as shown in Figure 5. The default-to-one-inch-pressure-class Pa provisions were retained in case designers do not give construction pressure classes. Blank spaces are not economical. A minimum of 16 gage 1. Air velocities will vary within the system. A duct section between adjacent hangers must be able to carry its own weight and to resist external loads for which it is constructed.

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Description: Pat Bentz, Vienna, VA. In our tests, the differences in relative vibration however are significant enough to assume that an increase in radiated sound will result from an increase in vibration of the sheet. The contractor shall follow the application recommendations of the manufacturer of all hardware and accessory items and select them to be consistent with the duct classification and services. Crossing tie rods must comply with S 1. The provisions for sealing ducts specified on page apply. Typically, they are impact-applied, hardened steel fasteners which bite into the sheet metal.
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