Proper Attic Ventilation For Whole House Fan

The issue with a whole house fan is that the hot air needs somewhere to go.

Proper attic ventilation for whole house fan.

Divide the cubic feet measurement by the cfm rating assigned to the fan. What this means is that every eleven minutes the air in the home is being exchanged by a fan of this rating along with having windows open in each room. Multiply the number of square feet of the floor area you want to cool by the room height from floor to. They remove the hot air out of the house.

Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed. You may be able to use the heating and air conditioning ducts in your home as a means of whole house ventilation. Determine how much net free venting your fan will require. Proper attic ventilation for whole house fan.

It helps to cool your home and attic by up to 30 degrees and more. You can set a multi speed fan to a lower speed when noise is a problem. All whole house fans should be installed with rubber or felt gaskets to dampen noise. A whole building ventilation fan typically 30 to 130 cfm is different than a whole house cooling fan which is a 3 000 5 000 cfm fan used for night cooling during hot weather references to a california code requirement for insulated shutters on whole house fans refer to the large opening into the attic required for high volume whole house cooling fans.

The warm air then escapes through the attic and to the attic vents allowing the circulation of fresh air from the windows. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Making sure you have adequate roof vents which allow the hot attic air to escape is important. If your attic isn t ventilated well that humid moist air will build up in the attic space and can cause mold to grow.

Using your duct system as a whole house fan. Take the total cubic feet per minute of air flow cfm of the fan and divide by 750 2. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. The whole house fan installed inside the attic between the living space and ceiling.

August 4 2020 by zamira leave a comment. Intake vents located at the lowest part of the roof under the eaves allow cool. 17600 cubic feet 1600 11. Most building codes require a ratio of 1 150 ventilation space to attic floor space.