Manufactured from lightweight but durable polyethylene, the Dri-Eaz Layflat Ducting (F268) 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. Each roll is 500' long and 13" wide when flat, expanding to 8.3" diameter when inflated. Can be cut to any length needed.