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):
ATTIC SIZE :
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
8' pieces or
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
12.7 sq.in./foot NFA Continuous Soffit Intake Vents for 0 lot line
MOFLO® RIDGE VENTS (EXHAUST) - 18 sq.in./foot NFA