Joints of duct programs shall be produced considerably airtight via tapes, mastics, liquid sealants, gasketing or other authorized closure units. Closure devices utilised 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 methods https://platgalvanis71604.onesmablog.com/5-tips-about-flexible-duct-you-can-use-today-76027131