How Many Turbines Do I Need On My Roof

How many turbine vents you will need depends on a number of factors including the size and type of building.

How many turbines do i need on my roof.

The first step in determining how many vents you need is to calculate the net free area nfa required. If you decide to add more turbine vents to your roof be sure to buy ones that are aluminum. 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. Most codes use the 1 300 rule for minimum residential attic ventilation recommendations.

This means that for every 300 square feet of enclosed attic space 1 square foot of ventilation is required with half at the upper portion exhaust. There are also gable and roof fans which actively pull the hot air out of the attic. Having the correct number of turbine vents will provide an effective and balanced system. The turbines are adjustable so that the spinning part is level even though the roof is slanted.

Unlike turbines this venting style does not have any moving parts. Use this simple diy guide to figure out which turbine ventilator best suits your needs. Not all turbines will fit all roof pitches. There s no point in wasting time and money getting the wrong ventilator for your roof though.

A turbine has a series of vanes that spin as wind passes through them. As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space. These will not rust. Using a roof turbine ventilator to increase the flow of air in your attic is a great idea.

Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.