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Vol 2 - Garney Construction

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D. Water-Based Sealants:1. Listed by manufacturer as nonflammable in wet and dry state.2. Manufacturers and Products:a. Foster; Series 32.b. Childers; CP-145A, 146.c. Rectorseal; Airlok 181.2.04 DUCTWORK FASTENERSA. General:1. Rivets, bolts, or sheet metal screws.2. Ductwork fasteners shall be same metal as duct being supported, unlessotherwise noted.B. Self-Drilling Screws:1. Galvanized Steel Ductwork System: Sheet metal screws shall be hexwasher head (HWH) TEKS® self-drilling type, formed from heattreatedcarbon steel with zinc electroplated finish.2.05 DUCTWORK PRESSURE CLASSA. Construct duct systems to pressure classifications indicated as follows:1. Supply Ducts: 3-inch WC.2. Exhaust Ducts: 2-inch WC, negative pressure.2.06 RECTANGULAR DUCTWORKA. Fabricate rectangular ducts in accordance with SMACNA RectangularIndustrial Duct <strong>Construction</strong> Standards, unless specified otherwise.B. Crossbreaking or Cross Beading: Crossbreak or bead duct sides that are19 inches and larger and are 20-gauge or less, with more than 10 square feet ofunbraced panel area, as indicated in SMACNA Manual, unless they are linedor are externally insulated.2.07 RECTANGULAR DUCTWORK FITTINGSA. Fabricate elbows, transitions, offsets, branch connections, and other ductconstruction in accordance with SMACNA Rectangular Industrial Duct<strong>Construction</strong> Standards.PW/WBG/382059METAL DUCTS AND ACCESSORIESAUGUST 15, 2012 23 31 13 - 7©COPYRIGHT 2012 CH2M HILL

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