THE SMART TRICK OF FLEXIBLE DUCT THAT NO ONE IS DISCUSSING

Joints of duct devices shall be produced considerably airtight through tapes, mastics, liquid sealants, gasketing or other permitted closure programs. Closure devices employed with rigid fibrous glass ducts shall comply with UL181A and shall be marked181A-P for pressure-delicate tape, 181A-M for mastic or 181 A-H for warmth-delicate tape. Closure u