ATTIC VENTILATION CALCULATOR
Note: Calculations are based on 1 square foot of Net Free Area
for every 150 square feet of attic floor space.

SELECT THE ROOF PITCH THAT IS CLOSEST TO YOURS

ROOF PITCH :Up to 6/12 7/12 to 10/12 11/12 and Up

Enter the width and length of your home, including overhang (in feet): WIDTH :   Ft   LENGTH :   Ft ATTIC SIZE :   Sq. Ft.

Read Intake Vents and Exhaust Vents needed at specific Roof Pitch. Numbers are expressed as Linear Feet. SNAPVENT® / EZVENT® Continuous Soffit Intake Vents - 9 sq.in./foot NFA Linear Ft.  You need  8' pieces or 12' pieces For attics greater than 3500 sq.ft. we recommend a minimum of 12.7 NFA per foot WIDE SNAPVENT® / WIDE HAT SHAPED VENT - 12.7 sq.in./foot NFA Linear Ft. You need  8' pieces 12.7 sq.in./foot NFA Continuous Soffit Intake Vents for 0 lot line MOFLO® RIDGE VENTS (EXHAUST) - 18 sq.in./foot NFA Linear Ft.