How Many Square Feet Per Roof Turbine

Attic must have 5 sq.

How many square feet per roof turbine.

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. Ft of vent space half dedicated for air intake in the soffits and the other half for exhaust on the roof. 1 100 square inches of intake net free area needed. 2 200 2 1 100 square inches of exhaust net free area needed.

50 exhaust 3 3 sq. And this guideline you ll need a minimum of. 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. Thousands of cfm per hour.

The quotient is the amount of ventilation you will need for your attic. How many turbine vents you will need depends on a number of factors including the size and type of building. They should be divided equally between inlet and outlet vents and they can be used in any combination that will work with your roof s design. First find out the square footage of your attic and sketch it onto the graph paper.

50 intake 1 7 sq. 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. The next step is to select a suitable exhaust vent and intake vent that fits the roof design for best performance and best aesthetics. 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.

50 exhaust 1 7 sq. 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. Having the correct number of turbine vents will provide an effective and balanced system.

Of vented area for every 300 sq. Now take the square footage number and multiply it by 144. 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. Then divide that calculation by 144 to convert the square inches to square feet.

As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. 1 000 divided by 150 6 66 total square feet 50 intake 3 3 sq. Furthermore this will ensure that a continuous supply of air moves through the desired space. This will give you square inches instead of square feet.

Take this number and divide it by three hundred. 1 000 divided by 300 3 33 total square feet.