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Calculating Ventilation Requirements:
Most industry authorities and Local Building Codes recommend a minimum of 1/300th of horizontal roof area be provided in ventilation.
Use the Duraflo Ventilation Calculator to determine your home's ventilation requirements. The calculator will determine the number of square inches of NET FREE AREA required for adequate attic ventilation based on the 1/300th general requirement.
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Here's how to determine your requirements:
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Now you can select the appropriate Duraflo ventilators by referring to the NET SQUARE INCHES ratings for different models within our catalogue.
For proper ventilation balance:
- 50% of your total NET FREE AREA should be vented from the soffit area and
- 50% should be vented from the roof area.
Example:
The horizontal roof area of your home (including overhang) is 36 feet by 28 feet.
In this example the Duraflo NFA Calculator will provide your NEW FREE AREA as 483.
You require 483 square inches of ventilation, ideally:
- 241.5 square inches spread out in the soffit areas and
- 241.5 square inches located in the roof area.
Note: In this example, rounding off your "roof area" requirements to 250 sq. in. you would need 5 duraflo 6050-50 sq. in. roof vents.
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