A quality non-insulated flexible air duct of reinforced aluminized trilaminate which is mechanically locked together by a corrosive resistant galvanized steel helix.
A ULC-S110 and UL-181 Class 1 product, formed by the protective outside helix which interlocks with the smooth and reinforced line to produce an exceptional low to medium pressure duct often required by VAV commercially deigned air conditioning and heating applications.
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