The outlet allows the exhaust to be piped out a widow. 30 cfm fan didn't cut it. I used a 62db 100cfm 80mm fan from ebay (http://www.ebay.com/itm/130654982712). Model is: FFB0812UHE . Requires a 12V 2A supply unfortunately. With this setup, no ABS plastic smell is apparent. Good thing too, because my health was being negatively affected by the ABS fumes. I used plastic insulation sheeting to shore up the top of the outlet to the top of the window opening. Considering to install another fan at window side to help airflow. Also will come in handy to disconnect the hose and reverse this fan's direction to force feed fresh air inside - since opening the window for ventilation will no longer be convenient.