Flexible duct connection details for rectangular and round HVAC ductwork configurations incorporating a specified flexible material insert. The assembly utilizes one-inch by one-eighth-inch band iron and draw bands secured with bolts spaced on four-inch centers. Sheet metal screws are spaced at twelve inches on center typically, with rivets spaced at four inches on center. The installation maintains a minimum one-and-one-half-inch to three-inch clearance, with six inches nominal when the material is taut.
1/2" 1/2" 1 1/2" ROUND FLEXIBLE CONNECTION ALTERNATIVE BOLT LOCATION DUCT WASHER FLANGED CONNECTION ON FAN SIDE FLEXIBLE MATERIAL AS SPECIFIED 1"x1/8" BAND IRON BOLTS ON 4" CENTERS 1" FLANGE & HEM 1 1/2" POCKET SLIP 1-1/2" MIN. TO 3" MAX. INSTALLED, 6" NOMINAL WITH MATERIAL TAUT. SHEET METAL AS SPECIFIED FOR DUCTWORK RECTANGULAR FLEXIBLE CONNECTION SHEET METAL AS SPECIFIED FOR DUCTWORK DUCT 1"x1/8" DRAW BAND (TYP) 1"x1/8" BAND IRON BOLTS ON 4" CENTERS 5/16" FLANGE SHEET METAL SCREWS 12" ON CENTER (TYP) RIVETS 4" ON CENTER DUCT 1-1/2" MIN. TO 3" MAX. INSTALLED. 6" NOMINAL WITH MATERIAL TAUT. WASHER FLANGED CONNECTION ON FAN SIDE FLEXIBLE MATERIAL AS SPECIFIED
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