Free Online Tool
Roof Vent Calculator
Calculate attic ventilation requirements.
Enter Your Measurements
Pro Tips
- •1:150 ratio of NFA to attic floor area is standard.
- •Balance intake (soffit) and exhaust (ridge) vents 50/50.
Recommended Tool
Milwaukee 25ft Magnetic Tape Measure (48-22-7125)
Nylon bond blade protection, 5-point reinforced frame, and 9ft standout with finger stop.
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