It Is an uninsulated Duct made of double lamination of aluminium foil and metalised polyester film permanently bonded to a spring steel wire helix.
Standard Length : 25 feet
Standard Diameter : 4 inch to 20 inch
Velocity : 5,000 fpm max.
Fire Rating : certified to BS 476 parts 5,6 and 7.
Packing : 1 piece ( 25 feet ) per carton
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