Because the pipe gets hot building codes require 1 in.
Blow hot air into attic form closet.
Of clearance from class b flues 2 in.
The opening around a furnace or water heater flue is a major source of warm air into the attic photo 5.
In the winter months you will be injecting hot air into the room compounding the problem.
Adding a server closet return.
Kadin2048 i writes i don t think that condensation in the attic is really a problem in my area the attic is so hot it s almost certainly warmer near the peak than the exhaust air from the ac but in some areas or if you were using the ac to cool a particularly hot room like a server closet on a cool day it very well might be a problem.
Insulated attic fan door newer attic fans have insulated doors that close in 30 seconds when the fan s not operating.
Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.
From masonry chimneys to any combustible material including insulation.
It draws cooler outside air in through open doors and windows to create a pleasant breeze that pushes hot air out through attic vents.
To solve for exhausting this heat i took a two pronged approach.
Hot air exhaust vents located at the peak of the roof allow hot air to escape.
What we need to do is exhaust the warm air from the room not inject air.