Joints of duct methods shall be made significantly airtight by the use of tapes, mastics, liquid sealants, gasketing or other authorised closure units. Closure devices applied with rigid fibrous glass ducts shall comply with UL181A and shall be marked181A-P for pressure-sensitive tape, 181A-M for mastic or 181 A-H for warmth-sensitive https://johnl036wdi0.bloggactivo.com/profile