How Many Square Feet Per Roof Turbine

Take this number and divide it by three hundred.

How many square feet per roof turbine.

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. What are the building code requirements for ventilating a roof. 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. 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.

We want to share those questions and answers with you. Which roof vents are best based on roof type climate and budget for example. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. 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.

1 square foot of ventilation for every 300 square feet of space for pitched roofs with vapor barriers. Now take the square footage number and multiply it by 144. 1 100 square inches of intake net free area needed. 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.

Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents. Because vents are rated in square inches you need to convert the square feet required to square inches. 30 lineal feet required. The quotient is the amount of ventilation you will need for your attic.

2 200 2 1 100 square inches of exhaust net free area needed. Then divide that calculation by 144 to convert the square inches to square feet. Say the contractor is standing in front of a house that has an attic with 2 200 square feet. First find out the square footage of your attic and sketch it onto the graph paper.

This will give you square inches instead of square feet. 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. Thousands of cfm per hour. This is accomplished by taking the square feet recommended and multiplying by 144.

Although more vent is generally better replacing a turbine vent with a standard flat vent is acceptable as long the vent is big enough for the square footage of the attic space. For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square.