Instructions / Assembly

Proper Flexible Duct Connections
• Sleeves used to connect 2 flex duct pieces
together shall be a minimum of 4 inches
in length and beaded on each end.
• For non-metallic ducts, fittings shall be
beaded and have a minimum of 2 inches
collar length.
• Use tapes or mastics listed to the UL181B Standard and marked “UL181B-
FX” for tape and “UL181B-M” for mastic.
• If non-metallic straps are used, the straps should be listed to the UL181B
Standard and marked “UL181B-C”. Maximum pressure is limited to 6 inches
W.C. with non-metallic straps.