These fans shall be installed to exhaust air through a wall. They are equipped with outside shutters which will open when the fan is on and vice versa. There is a wide range of products, either blade size or functions, that can fit various requirements.

Compared with previous models, new models adopt HP (Half-Pitch) motor and long life bearing that prolong the product durability, from average 30,000 hours life time to 60,000 hours.