The roofing industry also has practical guide lines for attic ventilation.
Venting an attic in a new build house.
In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq.
Power gable vent shutter is designed to be used with master flow egv pg series electric gable fans.
The model building codes allow both vented and unvented roof assemblies.
Of vent for every 300 sq.
Therefore whole house fans are best suited for open well vented attics.
Building codes vary.
Whole house fans powered attic fans.
Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.
If your attic isn t ventilated well that humid moist air will build up in the attic space and can cause mold to grow.
The choice of venting or not venting is a design and construction choice not a requirement determined by the physics or by the building code.
The applicable physics impacts the design of attic or roof systems as does the applicable building code but neither limit the choice.
Code requirements the international building code.
Constructed of white aluminum that can be painted.
Power gable vent shutter is automatic 20 in.
These fans may be controlled by a switch or a thermostat which detects heat build up in the attic space and automatically exhausts the attic space.