How Many Square Feet Per Roof Turbine

Now take the square footage number and multiply it by 144.

How many square feet per roof turbine.

1 square foot of ventilation for every 300 square feet of space for pitched roofs with vapor barriers. The next step is to select a suitable exhaust vent and intake vent that fits the roof design for best performance and best aesthetics. Say the contractor is standing in front of a house that has an attic with 2 200 square feet. This is accomplished by taking the square feet recommended and multiplying by 144.

First find out the square footage of your attic and sketch it onto the graph paper. Thousands of cfm per hour. 2 200 2 1 100 square inches of exhaust net free area needed. 1 100 square inches of intake net free area needed.

There are also gable and roof fans which actively pull the hot air out of the attic. Because vents are rated in square inches you need to convert the square feet required to square inches. Which roof vents are best based on roof type climate and budget for example. 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.

Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents. 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. Thus if your attic is 450 square feet you need roof vents equaling 3 square feet. 30 lineal feet required.

The quotient is the amount of ventilation you will need for your attic. What are the building code requirements for ventilating a roof. For example a 6 by 12 inch soffit vent has 72 square inches which when divided by 144 results in a 0 5 square. 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.

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. We want to share those questions and answers with you. Take this number and divide it by three hundred. This will give you square inches instead of square feet.

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. 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.