How Many Attic Turbines Do I Need

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.

How many attic turbines do i need. Unlike turbines this venting style does not have any moving parts. Calculate or enter the square footage of the attic or area to be vented. 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. One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home.

I d put three or four on a roof to really have a good chance at cooling an attic on a hot summer day. Good attic ventilation is important for preventing ice dams in the winter. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. Having the correct number of turbine vents will provide an effective and balanced system.

Furthermore this will ensure that a continuous supply of air moves through the desired space. How many turbine vents you will need depends on a number of factors including the size and type of building. A turbine is installed directly on the top of a roof and uses wind power to suck hot and humid air out of the attic. Passive vents work for free and in almost all instances are silent.

Attic must have 5 sq. Thus 6 66 divided by 2 3 33 square feet of attic ventilation for intake and 3 33 square feet of attic ventilation for exhaust. These can be ridge vents wind turbines or the flat vents your roofer wants to install. Since you want a balanced system you divide by 2 so that half of the ventilation is intake and half is exhaust.

Take this number and divide it by three hundred. A turbine has a series of vanes that spin as wind passes through them. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. A ridge vent runs across the top of the roof s peak.

There are also gable and roof fans which actively pull the hot air out of the attic. In contrast an active ventilation device might be an electric powered whole house fan or a powered roof ventilator. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space.