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8 9
Attic Ventilation is Good Business
8
Visit gaf.com/VentCalculator to calculate
the amount of Cobra
®
and Master Flow
™
vents needed for your next job.
In addition, QuickMeasure
™
reports
include popular GAF Attic Vents with
recommended quantities for each project.
Attic
ventilation
calculator
Attic ventilation calculator
Attic ventilation calculator
To learn more visit gaf.com/VentCalculator
The 1:300 ventilation rule
Include a minimum of 1 sq. ft. of ventilation,
evenly split between intake and exhaust,
for every 300 sq. ft. of attic oor
Balanced ventilation
Amount of intake
=
Amount of exhaust