Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Blow hot air into attic form closet.
Locate the main plumbing stack furnace flue or chimney and note this on your sketch for a reference point once you get into the attic.
Of clearance above the fan.
They have thermostats that turn the fan on at a recommended preset temperature of 100 110 degrees.
Put it in an attic full of blown insulation and you re forcing it to work harder to vent its heat.
But it gets worse.
In the winter months you will be injecting hot air into the room compounding the problem.
What we need to do is exhaust the warm air from the room not inject air.
To solve for exhausting this heat i took a two pronged approach.
Intake vents located at the lowest part of the roof under.
Tape cardboard around the fan to cover large gaps.
Exhausting it into a closet would be bad and wouldn t give you any net cooling in fact you d heat the system up from electricity consumption.
Once you re ready place a box fan in a window so it s blowing air into the house and close all the remaining windows and doors.
A powerful fan draws cooler early morning and evening air through open doors and windows and forces it up through the attic and out the roof vents.
The pressurized air in the attic will force its way through ceiling cracks into the conditioned house.
Install electric ventilators and attic fans which remove hot air from an attic.
This sends hot air up and out cooling your house and your attic.
Alternatively install passive vents such as gable soffit and ridge vents which are openings in the roof that allow hot air to escape.
In other words the fan will make the ceiling leak at a higher rate than it otherwise would.
In addition to making the unit hard to get to for service high attic heat can trigger the.
If you aren t renting or you have an understanding landlord you could run rigid metal vent pipe into the attic and then up and trough the roof capping it with a vent cap.