Raygun Electric



Bath Exhaust and Kitchen Fans

The Importance of Bathroom and Kitchen Fans

Bathroom and kitchen fans are an important part of your home's ventilation system. They remove odours from your house, which improves indoor air quality. They also remove moisture, which decreases the level of humidity in your house. High humidity can damage building materials and can cause mold growth. Mold may affect your family's health.

Common Fan and Exhaust Systems

The two most common types of fans are impeller fans and blower fans.

Impeller fans move air with blades similar to airplane propellers.

Blower fans look like hamster wheels — they are often called squirrel cages — and generally do a better job of moving air than impeller fans.

Most exhaust systems consist of an exhaust fan, ducting and an exterior hood. Some houses have a central exhaust system, in which one fan draws moisture and odours from several rooms of the house using a network of ducts.

Kitchen exhaust systems usually have the fan and fan motor in the exhaust hood. Other systems use an in-line fan, which is in the exhaust duct, or a fan outside the house. In-line and outdoor exhaust fans are usually quieter than systems with the fan in the room.

A heat recovery ventilator (HRV) also exhausts moisture and odours. An HRV is a self-contained ventilation system that provides balanced air intake and exhaust. Like a central exhaust fan, it can be connected to several rooms by ducting.


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