Ft divided by 150 equals 10 sq.
Calculating attic ventilation needs.
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.
Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.
Other options to meet your attic ventilation needs are.
Hence you would need two square feet 600 300 of attic ventilation.
How attic ventilation works.
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.
Let s use the following simple ranch house for an example.
Intake vents located at the lowest part of the roof.
Ridge vents are one of the easiest ways to meet roof venting requirements.
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.
Divide the square footage item 1 by 300.
The two square feet is divided equally between the intake and the exhaust one square foot for each.
The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes.
Calculate the square footage of the attic space.
For balanced ventilation an equal amount of intake vent area net free area should also be installed.
His next step is to calculate the total amount of ventilation that he has in his attic.
Use this calculator to help determine the proper amount of attic ventilation based on u s.
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.
Of total vent space needed.
Calculate the total vent area needed.
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.
His home is 48 feet long and has a ridge vent that measures 46 feet.
A 50 x 30 attic would have a total area of 1 500 sq.
Calculating ventilation area of attic kitchen ventilation text.
Gaf attic ventilation calculator.
Result of item 1 300.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
The house measures 30 feet by 50 feet.
Standard attic vents like af 50 s ventilation fans or solar powered attic fans.
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.
Calculating attic ventilation requirements.
