Back to Vent Calculator
Print
Total Square Feet of Attic Space to be Ventilated
Total Square Feet of Attic Space to be Ventilated:
27'
Required Method:
1/150
Calculation:
27 ÷ 150 = 0.18 sq. ft. of Code Required Ventilation
Convert square feet of code-required ventilation to square inches
Square Feet of Code Required Ventilation:
0.18
Calculation:
0.18 x 144 = 25.92 sq. in of Code Required Ventilation
Square Inches Provided:
(2 x 72) = 144 sq. in
Square Inches Needed:
0.18 x 144 = 25.92 sq. in
Where do I install vents graphic
Vent Placement
High / Exhaust Vents Needed:
1
Low / Intake Vents Needed:
1
Total Vents Needed:
2
Composition shingle
Low Profile (Tapered)
NET FREE VENTILATION AREA
Wire Mesh 72 sq. in
Figures based on independent evaluation reports.
Comp Roof Drawing
Questions?