Proper Attic Ventilation For Whole House Fan

Using your duct system as a whole house fan.

Proper attic ventilation for whole house fan.

The warm air then escapes through the attic and to the attic vents allowing the circulation of fresh air from the windows. 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. You may be able to use the heating and air conditioning ducts in your home as a means of whole house ventilation. Most building codes require a ratio of 1 150 ventilation space to attic floor space.

Determine how much net free venting your fan will require. If your attic isn t ventilated well that humid moist air will build up in the attic space and can cause mold to grow. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. You can set a multi speed fan to a lower speed when noise is a problem.

Take the total cubic feet per minute of air flow cfm of the fan and divide by 750 2. Before we explore how to ventilate an attic space it is prudent to understand how much ventilation is needed. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. Calculate the appropriate size of a whole house fan needed to properly ventilate your home.

5 myths about attic ventilation attic fan diagram schematic wiring design attic breeze solar fans venting a bathroom fan into an attic quiet cool whole house fans service. Ventilation can be accomplished using various products and techniques. All whole house fans should be installed with rubber or felt gaskets to dampen noise. 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. Divide the cubic feet measurement by the cfm rating assigned to the fan. It helps to cool your home and attic by up to 30 degrees and more.

Making sure you have adequate roof vents which allow the hot attic air to escape is important. The issue with a whole house fan is that the hot air needs somewhere to go. They remove the hot air out of the house. 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.