Heavy duty, spring wire reinforced, flexible ducting for intake or exhaust use. Made of an inner layer of polyester of 1.0 mil thickness and an outer layer of polypropylene of 2.2 mil thickness for a total of 3.2 millimeter thickness with a spring wire reinforcement of .051 gauge. Ducting is white in color. May be used with negative air machines and other air movement applications. Sold in sections of 12 inches in diameter by 25 feet in length.
