Divide the attic s square footage by 150.
Calculating attic ventilation needs.
Hence you would need two square feet 600 300 of attic ventilation.
Ft divided by 150 equals 10 sq.
Tips for assessing your needs.
The two square feet is divided equally between the intake and the exhaust one square foot for each.
Use our easy 3 step attic ventilation calculator to determine your attic square footage and ventilation needs.
Calculate or enter the square footage of the attic or area to be vented.
Result of item 1 300.
The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space.
Calculate the square footage of the attic space.
Most attic ventilation manufacturers list the longer formula on their websites and inside key product brochures.
Calculating attic ventilation requirements.
Calculate the total vent area needed.
Calculation q a.
The house measures 30 feet by 50 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.
Other options to meet your attic ventilation needs are.
Calculating ventilation area of attic kitchen ventilation text.
Let s use the following simple ranch house for an example.
But the shortcut is just as good and faster.
Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.
If you are in the puget sound area of washington state and would like to have a free attic ventilation evaluation or roof estimate please contact us at 253 445 8950 or fill out our quick estimate form.
Here are the answers to the five most frequent questions pertaining to calculating attic ventilation.
Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.
For balanced ventilation an equal amount of intake vent area net free area should also be installed.
Multiply the length of the attic times the width in feet to find the attic area then divide by 150 to find the total square feet of vent space needed.
Divide the square footage item 1 by 300.
Length x width of attic in feet 150 total sq.
Of total vent space needed.
Ok to determine how much ventilation area you need for your house all you need to know is the square foot area of the attic to be ventilated.
