Flexmaster Type 1 Acoustical Flexible Duct is now available. 

10" W.G. Positive
10" W.G. Negative thru 12"
5" W.G. Negative, 14" & 16"
1" W.G. Negative, 18" & 20"

Core: Polyethylene (PE)
Available in non-insulated or insulated.  R4.2, R6, R8

 Acoustical Comparisons Document

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