Two square feet equals 288 square inches.
Roof vent area calculation.
Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the roofing material calculator.
A normal metal pot vent produces only 50 squares inches of free net area.
Select ventilation product flex roll ridge vent multi roll multi purpose vent rigid roll ridge.
To accurately calculate the area of your roof you must first determine its slope or pitch.
A 12 in 12 pitch is a.
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.
Ridge static attic vents 384 00 minimum sq.
The most common roofing materials used in the united states include shingles.
Of total vent space needed.
Ft divided by 150 equals 10 sq.
A 50 x 30 attic would have a total area of 1 500 sq.
In order to have a balanced ventilation system you need to have the right roof vent calculation.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
Use avp s roof vent calculator to determine the number and size of exhaust vents you will need.
For the 1 150 attic ventilation requirement simply double the amount of exhaust and intake calculated.
Enter square footage calculate or enter the square footage of the attic or area to be vented.
Of net free area of intake needed at or near the soffit.
Length x width of attic in feet 150 total sq.
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.
According to their requirements you should have 1 square.
Roof ventilation calculator enter your attic area or length and width to determine your ventilation needs.
Of net free area of exhaust needed at or near the ridge.
The calculations before indicated that we needed 2 square feet of ridge or upper roof ventilation.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
Width or area.
Calculate the total vent area needed.
For balanced ventilation an equal amount of intake vent area net free area should also be installed.
Attics area can heat up to 165 degrees f or more 73 9 c.
The federal housing authority fha and the urban development hud have established minimum requirements for attic ventilation.