Test the wires to ensure the power is off.
Attic fan breaker size.
First is the thermostat calling for the fan when the breaker is turned on.
For a single story house this is usually the same as the square footage of the house itself plus any attached garage area.
Of roof vent area for every 300 sq.
20 x 50 1 000 sq.
Example 20 wide by 50 long attic.
Turn off electricity at the main fuse box or circuit breaker box that controls the power to the fixture or the room you re working on.
An attic fan is an electric exhaust fan that mounts in your home s attic.
When working with electricity always.
To determine the size of your attic multiply the width by the length of the attic floor in feet.
A whole house fan sucks warm house.
A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning.
How to size a whole house attic fan.
You also want a fan that s appropriate for the square footage of your attic space by checking the manufacturer s specifications.
I assume we are talking about an a c airhandler and not a whole house fan or attic vent fan.
Before running out to buy an attic fan take some time to check the existing attic ventilation on your house.
Meaning if nothing is telling the fan to run and the breaker trips we re looking at and for a direct short in the supply line power to the unit.