Insert Attic Size in the box above then press the CONTINUE button below. Read Exhaust Vents and Intake Vents needed at specific Roof Pitch. The first page of this calculator features Ridge Vents, Static Vents and Wind Turbines; the second features Power Vents. Numbers are either Units or Linear Ft.*

Notes: 1) Check the installation instructions for roof pitch requirements for all products.

2) Calculations (except Power Vents) are based on the Code Minimum of 1 square foot of Net Free Area for every 150 square feet of attic floor space balanced between Exhaust and Intake Vents. To achieve the allowable Code Exception of 1/300, use half the number of vents specified.

3) Power Vent calculations are based on attic square footage multiplied by 0.7.

 1-800-AIR-VENT     www.airvent.com      2023 Air Vent (v2023-11-30)