Replaces the old one in the camper. I was happy to see that it comes with a fan separate from the motor as I have a fixed rod on the air duct that cannot be removed. Managed to install the motor and then add a fan blade through the air duct to the motor. Works perfectly. Airflow for this service is correct when said to be from the engine mount to the blades and out of the trailer. From the bathroom to the street. Didn't understand the description of turning counterclockwise from the motor shaft. Bought a second one to replace in a second bathroom.