The exhaust nozzle comes standard with the model ARP-1000ES single hose unit and the dual hose units ARP-900EX, ARP-1000EX, and ARP-1200EX. The exhaust nozzle attaches to the window plate using four screws. The exhaust nozzle connector which is attached to the end of the exhaust hose then attaches to the exhaust nozzle. See additional information "Quick Setup Guide"