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💨 Bathroom Ventilation CFM Calculator
Calculate the right ventilation capacity for your bathroom to prevent moisture problems, mold, and poor air quality. Get accurate CFM requirements based on your bathroom size and usage patterns.
Bathroom Details
Enter your bathroom specifications to calculate proper ventilation requirements
Your Ventilation Requirements
50
Required CFM
80
Recommended CFM
8
Air Changes/Hour
3.0
Max Sound Rating
Calculation Breakdown
Room Volume:- cubic feet
Base Requirement:- CFM
Usage Multiplier:-
Special Features:-
🌪️ Fan Selection Recommendations
Enter your bathroom details to calculate ventilation requirements
Planning a Bathroom Remodel?
West Shore Home offers complete bathroom renovations with proper ventilation planning included
The calculator provides minimum CFM ratings based on ASHRAE 62.2 and building code standards
Heavy-use bathrooms benefit from 20-30% higher CFM ratings for better moisture control
Sound ratings (sones) are crucial - look for fans rated 1.0 sones or less for quiet operation
Steam showers and jetted tubs require significantly higher ventilation rates
Continuous operation fans can run at lower CFM but provide better overall moisture control
Consider humidity-sensing fans for automatic operation based on moisture levels
📋 Important Notes
These calculations are based on ASHRAE 62.2 standards and typical building codes. Local building codes may have different requirements. Always consult with local building officials and HVAC professionals for specific installation requirements. Proper installation, ducting, and electrical work should be performed by licensed professionals.
*All usage of tools, calculators, guides, and resources are at user discretion. West Shore Home does not guarantee the results or data that the tools provide as there are many additional factors that may invalidate results.
