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Must I use UL-Listed Duct Tape, Mastics and Clamps?

April 1, 2013

Yes. Our installation instructions are in full compliance with UL and ADC standards.

Yes. Our installation instructions are in full compliance with UL and ADC standards. As such, only duct tapes, mastics and non-metallic clamps that are listed and labeled according to the UL-181 standard can be used.  Metallic clamps are also allowed. The use of beaded sheet metal fittings is also required. 

Duct tape must be marked "UL181B-FX".  (established October 20, 1995.)

Mastics must be marked "UL-181B-M".  (established October 20, 1995.)

Non-metallic clamps must be marked "UL-181B-C".  Limited to 6" w.g. positive pressure.  (established May 15, 2004.)