NEW STEP BY STEP MAP FOR ALUMINIUM PLAT

Joints of duct programs shall be made considerably airtight through tapes, mastics, liquid sealants, gasketing or other accredited closure systems. Closure devices employed with rigid fibrous glass ducts shall adjust to UL181A and shall be marked181A-P for tension-delicate tape, 181A-M for mastic or 181 A-H for warmth-delicate tape. Closure devices