It can be controlled by a thermostat or moisture monitor.
How much roof venting for 6000cfm house fan.
It s all about balance.
Whether exhausting air or bringing fresh air into a structure the calculation produced should help to figure out the size of fan s required to accomplish the air exchanges needed.
The water will condense and drip into the insulation below and perhaps into the house.
To calculate the ventilation required with such a vapor barrier divide the square footage of the attic by 300 instead of 150.
Venting plays a huge part in how your quietcool whole house fan system works to its full potential.
A powered exhaust vent is much like a roof mounted exhaust fan.
However without enough venting area pressure can build up slowing down airflow and reducing efficiency potentially pushing hot attic air back into your living.
And since just about all attics are vented the pressurized attic air is then naturally pushed outside through those vents.
Of vent for every 300 sq.
Based on your 1100 sq.
Blades spin within the unit to expel air from the attic until the right temperature or moisture level is reached at which point it will automatically shut off.
Why having sufficient roof venting is important.
Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.
In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq.
Tips for assessing your needs.
We always recommend at least having 1 sqft of net free area venting for every 750 cfm in your system.
Static ventilation needs may be reduced if you have an uninterrupted ceiling vapor barrier installed with a rating of 0 1 perm or less.
Special bathroom fan roof vents with an internal damper that opens only when the fan is blowing will send moist air outdoors and keep cold air out of the house.
A whole house fan brings outdoor air into your home which is measured in cubic feet per minute.
And this guideline you ll need a minimum of.
As the air flows into your home and through your attic your roof vents allow the hot attic air to escape from your home.
Making sure you have adequate roof vents which allow the hot attic air to escape is important.
Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.
This fan calculator is typically used to calculate the cfm or cubic feet per minute of air exchange that may be desired in a building.
Near ridge of the roof.
