Gaf ventilation calculator proper attic ventilation can help reduce the load on your air conditioner.
Attic ventilation calculator ridge vent.
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.
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.
Nine hundred square inches equals 6 25 square feet.
All lomanco attic ventilation product requirements are based on the minimum standard 1 300 rule as set forth by the international building code ibc and the international residential code irc.
Attic vent calculator for years we have been working with architects and specifiers to ensure affordable roof ventilation that upholds building code standards.
Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph.
Ft divided by 150 equals 10 sq.
Length x width of attic in feet 150 total sq.
Then look across to the number under the minimum length of ridge column.
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.
A 50 x 30 attic would have a total area of 1 500 sq.
That tells you the total linear feet of ridge vent required using the 1 300 minimum code requirements.
How do you pick the right attic vent.
To calculate the amount of ventilation you need for your home visit gaf s ventilation calculator now.
Of total vent space needed.
To use this calculator first find the total square footage of the attic floor area.
Round your calculations up to the next highest number see appendix a.
Vent calculator design your balanced ventilation system.
So the ridge ventilation has exceeded the minimum requirement.
Intake vents located at the lowest part of the roof under the eaves allow cool.
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.
Calculate the total vent area needed.
Standard ridge vent produces 18 square inches of ventilating area per lineal foot.
