Lightweight air ventilation tubing (similar to a plastic bag) manufactured from durable clear polyethylene, has been engineered for maximum elasticity, flexibility, toughness, and resistance to splitting and tearing. Most commonly used for transferring large volumes of forced air to confined areas. Not designed for permanent installation. Collapses when airflow stops. Unaffected by moisture and most chemicals. 22" diameter flat. Length 500'. Fits up to 14" blowers.