This hose comes standard with the model ARP-1000ES single hose unit and the dual hose units models ARP-900EX, ARP-1000EX, and ARP-1200EX. The Exhaust Hose attaches to the exhaust duct connector. The hose is 1 foot long compressed and expands to 4 feet long and is 5 inches in diameter. See additional information "Quick Setup Guide"