Joints of duct systems shall be created considerably airtight via tapes, mastics, liquid sealants, gasketing or other accepted closure programs. Closure devices made use of with rigid fibrous glass ducts shall adjust to UL181A and shall be marked181A-P for stress-sensitive tape, 181A-M for mastic or 181 A-H for heat-delicate tape. https://rockwoolinsulation56790.review-blogger.com/56928450/plat-galvanis-can-be-fun-for-anyone