An insulated flexible duct is utilized in lieu of a rectangular duct, featuring one and one-half inch acoustic lining. The assembly connects transfer air grilles through duct elbows maintained at a minimum dimension of L, with a two L minimum spacing between elbows. An additional elbow is provided in restrooms as indicated on the plans.
NOTES: 1. PROVIDE ADDITIONAL ELBOW IN RESTROOMS AS SHOWN ON PLANS. 1½" ACOUSTIC LINING INSULATED FLEXIBLE DUCT ALLOWED IN-LIEU OF RECTANGULAR DUCT TRANSFER AIR GRILLE L L 2L MIN CEILING TO CEILING
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