THE RUBBER INSULATION DIARIES

Joints of duct systems shall be produced significantly airtight by way of tapes, mastics, liquid sealants, gasketing or other authorized closure devices. Closure units utilised with rigid fibrous glass ducts shall comply with UL181A and shall be marked181A-P for strain-delicate tape, 181A-M for mastic or 181 A-H for heat-delicate tape. Closure unit