Yet i still see the attic temperature reach 145 degrees.
How much attic fan do i need.
Attic fans are cheap compared to whole house fans.
You might need to consider the following while installing an attic fan.
It might cost you approximately 300 600 for purchase and up to 550 when you include labor.
That said air resistance and interference such as vent grates reduces the area of true ventilation.
Whole house fans need windows and doors open and attic fans need lots of soffit vents to suck cooler outdoor air up into the hot attic.
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.
Attic fans exhaust hot air from your attic to the outside.
Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.
When i last had a new roof installed a few years ago i calculated the soffit intake area i d need for the ridge vent specs.
If you need 6 000 cfm of air flow through your house divide 6 000 by 750 to get a minimum 8 square feet of.
How an attic fan works.
Without this open space the fans will not move much air.
Attic x 0 7 700 cfm minimum fan rating add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof.
An attic fan is installed on the slanted side of your roof or on one of the gable sides of your attic.
You need a minimum of 1 square foot of attic air venting for each 750 cfm of air flow.
Powered exhaust vents feature an electric or solar powered fan to create an effect similar to that of a turbine view example on amazon.
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.
All you need to know about attic ventilation.
These fans are designed to remove excess heat from your attic which in theory is supposed to lessen the load on the air conditioning in your home.
Attic vent fans are commonly rated from 800 to 1 600 cfm making one fans suitable for attics of up to around 2 200 square feet.
All of that is in place.
Without exception you should talk to a professional to determine what your home requires.
