NOTE: Lomanco recommends the use of one gable vent per gable end of structure. Your roof must have the required number of gable ends to install the proper number of gable vents for a balanced ventilation system.
Your Required Exhaust NFA: None sq. in.
Calculated using 1:300
Calculating…
Choose the ratio required for your project. A 1:300 ratio provides 1 sq. ft. of total ventilation per 300 sq. ft. of attic area; 1:150 provides it per 150 sq. ft. These calculations allocate half to exhaust and half to intake. Confirm the applicable ratio with your local building authority.
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