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For Ridge Vents, Static Vents and Wind Turbines

Exhaust Vents Roof Pitch  
Up to 6/12 7/12 to 10/12 11/12 & Up
Ridge Vents
Airhawk® Static Vents
Wind Turbines
Intake Vents Roof Pitch  
Up to 6/12 7/12 to 10/12 11/12 & Up
Undereave Vents
Continuous Soffit Vents
Vented Drip Edge
Shingle-Over Intake

For Power Vents

Exhaust Vents Roof Pitch  
Up to 6/12 7/12 to 10/12 11/12 & Up
Gable Mount
Roof Mount
Intake Vents Roof Pitch  
Up to 6/12 7/12 to 10/12 11/12 & Up
Undereave Vents
Continuous Soffit Vents
Vented Drip Edge
Shingle-Over Intake

Instructions:

Insert Attic Size in the box to the left. Read Exhaust Vents and Intake Vents needed at specific Roof Pitch. The top half of this calculator features Ridge Vents, Static Vents and Wind Turbines; the bottom half 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 for Power Vents) are based on 1 square foot of Net Free Area for every 150 square feet of attic floor space balanced between Exhaust and Intake Vents. To achieve minimum code requirements (1/300), use half the number of vents specified.

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

Mobile Version.