How to Install an Attic Exhaust Fan

An attic exhaust fan moves hot, humid air out of the attic space and replaces it with outside air drawn through soffit vents. Excessive attic heat — common in Ontario summers — accelerates shingle degradation, raises cooling loads for the living space below, and creates condensation risks in winter. Installing an attic exhaust fan is an electrical project that requires an ESA permit in Ontario.

How to Install an Attic Exhaust Fan

Types of Attic Exhaust Fans

• Gable-mounted fans: Installed in the gable end of the attic. Draw air across the length of the attic.
• Roof-mounted fans: Installed through the roof deck near the ridge. Require flashing and a weather-tight roof penetration.
• Solar-powered fans: Operate without a wired electrical connection. No ESA permit required for the electrical portion.

ESA Permit Requirements

In Ontario, installing an attic exhaust fan that connects to the home’s electrical system requires an ESA permit. The fan must be connected to a properly rated branch circuit, and all connections must be in accessible junction boxes.

Contact Us

Need an attic exhaust fan installed with a proper ESA-permitted branch circuit? Our licensed electricians serve the GTA. Call us at 416-838-9006.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp