How to Use an Inline Exhaust Fan to Vent More Than One Bathroom First, install plastic exhaust grills in each bathroom ceiling. Run 4-in. flexible ductwork from the grills to the inline fan.

【Suitable for 4 inch Diameter Round Vent & Duct Fan】Our window vent kit designed for exhaust and intake purposes to help effectively expel odors and draw in fresh air.also can use with ...