Then look across to the number under the minimum length of ridge column.
Attic ventilation calculator ridge vent.
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.
Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph.
How do you pick the right attic vent.
Length x width of attic in feet 150 total sq.
Standard ridge vent produces 18 square inches of ventilating area per lineal foot.
Of total vent space needed.
Attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards.
Calculate the total vent area needed.
To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now.
So the ridge ventilation has exceeded the minimum requirement.
Nine hundred square inches equals 6 25 square feet.
That tells you the total linear feet of ridge vent required using the 1 300 minimum code requirements.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Round your calculations up to the next highest number see appendix a.
The first step is to check out this 60 second video and learn about the 300 1 rule the difference between intake and exhaust ventilation and why proper ventilation is so important to get right to help calculate your attic ventilation needs visit gaf ventilation calculator.
Ventilation calculator 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.
Vent calculator design your balanced ventilation system.
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.
Ft divided by 150 equals 10 sq.
Gaf ventilation calculator proper attic ventilation can help reduce the load on your air conditioner.
A 50 x 30 attic would have a total area of 1 500 sq.
Our roof is 50 feet long so using a standard product we will get 900 square inches of ventilating space.
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.
