These models are the best of the bunch, according to our tests—evacuating air through the duct while keeping noise to a minimum. Best Bathroom Exhaust Fans for 3-Inch Ducts Fans built for 3-inch ...

a single exhaust duct exits through the roof. Each bathroom has its own switch and operates independently. Inline exhaust ...

(The hot air may be seeping into the room instead ... Poke it inside the dryer exhaust duct and vacuum out what you can. It is good to have a vacuum cleaner with a HEPA filter for this.