from lightweight but durable polyethylene, this clear ducting has been
engineered for maximum elasticity and flexibility. Unaffected by
moisture and most chemicals, this strong, 4-mil ducting is ideal for use
with air scrubbers, negative air machines, and dehumidifiers. 500 feet
per roll. 13 in. wide when flat, expands to 8.3 in. diameter when
inflated. Cut to length.