Calculate the required airflow in Cubic Feet per Minute for room ventilation.
Room Specifications
sq ft
ft
Flow Requirements
Enter room size to calculate airflow
About this calculator
Overview
CFM (Cubic Feet per Minute) or m³/h (Cubic Meters per Hour) is a measure of the volume of air that a fan or ventilation system can move. Calculating the necessary airflow is essential for maintaining air quality and removing moisture or odors from a space.
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Pro Tips
For bathrooms, a good rule of thumb is 1 CFM for every square foot of floor area.
If you have an unusually high ceiling, use the volume-based calculation for more accuracy.
Keep duct runs as short and straight as possible to maintain the fan's rated airflow.
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Fun Facts
"A typical bathroom exhaust fan is rated for 50-110 CFM, while a large range hood can exceed 1,000 CFM!"
"HEPA filters often require higher airflow systems to overcome the resistance of the dense filter material."
"In modern 'airtight' homes, mechanical ventilation (like an HRV or ERV) is often required because natural air leakage is too low."
