How Many Square Feet Per Roof Turbine

The quotient is the amount of ventilation you will need for your attic.

How many square feet per roof turbine.

Depending upon the diameter of the vents and the wind speed outdoors the turbines can expel vast quantities of humid air before it becomes a problem. This is accomplished by taking the square feet recommended and multiplying by 144. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. Because vents are rated in square inches you need to convert the square feet required to square inches.

There are also gable and roof fans which actively pull the hot air out of the attic. Now take the square footage number and multiply it by 144. Take this number and divide it by three hundred. 2 200 2 1 100 square inches of exhaust net free area needed.

For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square. Say the contractor is standing in front of a house that has an attic with 2 200 square feet. The next step is to select a suitable exhaust vent and intake vent that fits the roof design for best performance and best aesthetics. 1 100 square inches of intake net free area needed.

1 square foot of ventilation for every 300 square feet of space for pitched roofs with vapor barriers. Then divide that calculation by 144 to convert the square inches to square feet. First find out the square footage of your attic and sketch it onto the graph paper. A small 12 inch diameter turbine vent with a constant wind speed of 5 miles per hour mph can remove 347 cubic feet of air per minute cfm from the attic space.

Which roof vents are best based on roof type climate and budget for example. This will give you square inches instead of square feet. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents.

Build your roof empowers you to select each layer and component that goes into your total protection roofing system so that you get the roof you want to protect your home. We want to share those questions and answers with you. Thousands of cfm per hour. What are the building code requirements for ventilating a roof.

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. 30 lineal feet required.