An air distribution box or duct is supported underneath by a Unistrut P1000 1-5/8 inch by 1-5/8 inch metal framing channel, secured by a 1-inch metal strap wrapped over the top and fastened to the channel sides with four number 10 tek screws. The Unistrut channel rests on snug-tight Thomas & Betts nuts threaded onto three-eighths-inch all-thread rods. These hanger rods suspend from the overhead building structure at a maximum spacing of eight feet, with lengths not exceeding twelve inches from the duct support point to the structure attachment point. This assembly applies when duct maximum section size is six square feet and total weight supported by any single rod is fifty pounds or less.
3/8" ALL THREAD ROD TYP. THREADED ROD (TYP.) SUPPORT FROM STRUCTURE. SEE STRUCT. FOR ANCHORAGE REQUIREMENTS DUCT OR AIR DISTRIBUTION BOX NOTE: 1. MAX SPACING 8 FT. 2. HANGER RODS DO NOT EXCEED 12" IN LENGTH FROM THE DUCT SUPPORT POINT TO THE STRUCTURE ATTACHMENT POINT. 3. DUCT MAX. SECTION SIZE: 6 SQ. FT. 4. TOTAL WEIGHT SUPPORTED BY ANY SINGLE ROD IS 50 POUNDS OR LESS. UNISTRUT P1000 1-5/8"x1-5/8" T&B NUT (SNUG TIGHT), TYP. #10 TEK SCREWS (TYP. 4) 1" METAL STRAP STRUT FASTENER
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