Attic Fan Calculator
Calculate attic fan size, CFM requirements, and installation costs. Determine proper ventilation for your home’s attic space.
Step 1: Attic Dimensions
Ventilation Standards
Proper attic ventilation requires 1 CFM per square foot of attic floor space. For hot climates or dark roofs, use 1.5 CFM per square foot.
Step 2: Fan Specifications & Cost
Energy Savings Note
Proper attic ventilation can reduce cooling costs by up to 30%. Attic fans help remove hot air, reducing strain on your AC system.
Attic Fan Requirements Estimate
Summary
Fan Specifications
Energy Savings
Total Estimated Cost
$785.00
1,800 CFM fan required
Required CFM
1,800 CFM
Fan Size
24-inch
Attic Volume
7,200 cu ft
Air Changes/Hour
15 ACH
Recommended Fan Specifications
| Specification | Value | Description | Importance |
|---|
Estimated Energy Savings
Attic Fan Calculation Formula
CFM = Attic Area (sq ft) × Climate Factor
Calculate attic floor area, multiply by climate factor (0.8 to 2.0). For proper ventilation, aim for 10-15 air changes per hour (ACH).
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