Inline Fan CFM Calculator
Calculate the required CFM for your grow tent exhaust fan accounting for carbon filter and ducting losses.
Inputs
ft
ft
ft
ft
Results
Required CFM
150 CFM
Room Volume96 cu ft
Recommended Fan Size4 in
Est. Static Pressure0.5 in WC
How to Use This Calculator
- Enter your grow tent's interior length, width, and height in feet to calculate the room volume.
- Indicate whether you are using a carbon filter — filters add roughly 25% airflow resistance and require a more powerful fan.
- Enter your total ducting length in feet; longer runs increase static pressure and reduce effective CFM.
- Review the Required CFM to select an appropriately sized inline fan.
- Use the Recommended Fan Size (inches) and Est. Static Pressure (in WC) to match a fan's performance curve at your operating conditions.
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