Duct Tape: Only use duct tape listed and labeled in accordance with U.L. 181B and marked "U.L. 181 B-FX" (established Oct. 20,1995).
Clamps: Non-metallic clamps shall be listed in accordance with U.L. 181B and marked "U.L. 181B-C". Use of non metallic clamps shall be limited to 6 in w.g. positive pressure (established May 15, 2004). |