Soffit Vent Calculator
Calculate soffit vent requirements for proper attic ventilation. Determine required vent area, spacing, and installation specifications for optimal airflow and moisture control.
Step 1: Attic Specifications
6:12
Ventilation Requirements
Standard requirement: 1 sq.ft. of vent area per 150 sq.ft. of attic floor space (1:300 with vapor barrier). Soffit vents should provide 50-60% of total ventilation.
Step 2: Vent Specifications
24 sq.in.
Optimal Ventilation
Soffit vents should be evenly distributed along eaves. Maintain 1:1 intake-to-exhaust ratio with ridge vents. Avoid blocking vents with insulation.
Soffit Vent Calculation Results
Summary
Ventilation Diagram
Vent Type Comparison
Required Soffit Vent Area
12.0 sq.ft.
For 1200 sq.ft. attic with vapor barrier
Total Vents Needed
72 vents
Vent Spacing
20 inches
Attic Floor Area
1200 sq.ft.
Ventilation Ratio
1:300
Ventilation System Diagram
Intake Efficiency
Excellent
Airflow Balance
Balanced
Moisture Control
Optimal
System Rating
A+
Vent Type Comparison
| Vent Type | Net Free Area | Installation | Best For |
|---|
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