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Solar Blaster Attic Ventilation Calculator

How Many Vents Will My House Need?

The U.S. Federal Housing authority recommends a minimum of at least 1 square foot of attic ventilation for every 300 square feet of attic floor space evenly split between intake and exhaust.

Use the calculator below to find out how many exhaust and intake vents you will need on your house.

How to Measure My Attic Floor Space?

If your house is rectangular, great. All you need to measure is the length and width of your house and enter them into the Vent Calculator below. It will do the rest for you.

If you house is something other than a rectangle, you will need to calculate the area (length x width) of the individual sections of your house; then add those all together and enter the total into the Area box of the Vent Calculator below.

Vent Calculator

Attic Floor Measurements


Ventilation Area (NFVA = Net Free Ventilation Area) Total required ventilation area for your house

Exhaust Ventilation Area needed for your house (50%)

Intake Ventilation Area needed for your house (50%)

Helpful Resources for Homeowners

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EagleView Report
As a homeowner, you should be informed about your home as much as possible. EagleView Technologies invented and patented the technology behind 3D aerial roof measurements. You can order several different reports on your home but we recommend you consider the Premium report to add to your home's portfolio. This will give you very detailed information about your roof which as a homeowner, you can use whenever you are getting bids for a new roof, etc. They also offer reports good for gutters and even outer wall measurements for future siding or paint jobs.
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Vents Needed on Your Home

Black Solar RVOblaster vent by Solar Blaster

Exhaust Vent Requirements

White 2" round vent by Maurice Frankland

Intake Vent Requirements