Attic Ventilation Calculator Ridge Vent

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 ventilation calculator ridge vent.

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. 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. How do you pick the right attic vent.

Calculate the total vent area needed. Round your calculations up to the next highest number see appendix a. Our passive roof vents are ul certified and rated to withstand wind pressure in excess of 200 mph. To use this calculator first find the total square footage of the attic floor area.

Then look across to the number under the minimum length of ridge column. So the ridge ventilation has exceeded the minimum requirement. Vent calculator design your balanced ventilation system. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Intake vents located at the lowest part of the roof under the eaves allow cool. 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. 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.

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. Ft divided by 150 equals 10 sq. Our roof is 50 feet long so using a standard product we will get 900 square inches of ventilating space.

Standard ridge vent produces 18 square inches of ventilating area per lineal foot. 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.