Calculate the square footage of the attic space.
Calculating attic ventilation needs.
Standard attic vents like af 50 s ventilation fans or solar powered attic fans.
The house measures 30 feet by 50 feet.
His home is 48 feet long and has a ridge vent that measures 46 feet.
Result of item 1 300.
Calculating attic ventilation requirements.
Calculate the total vent area needed.
The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes.
Let s use the following simple ranch house for an example.
For balanced ventilation an equal amount of intake vent area net free area should also be installed.
Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.
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.
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.
Ridge vents are one of the easiest ways to meet roof venting requirements.
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.
The ridge vent is cut back 1 inch on either side of the ridgeline which yields a total area of 7 67 square feet of ventilation.
His next step is to calculate the total amount of ventilation that he has in his attic.
Ft divided by 150 equals 10 sq.
A 50 x 30 attic would have a total area of 1 500 sq.
Hence you would need two square feet 600 300 of attic ventilation.
Divide the square footage item 1 by 300.
Length x width of attic in feet 150 total sq.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
Calculating ventilation area of attic kitchen ventilation text.
Other options to meet your attic ventilation needs are.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
How attic ventilation works.
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.
Intake vents located at the lowest part of the roof.
Of total vent space needed.
Use this calculator to help determine the proper amount of attic ventilation based on u s.
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.
