Ventilation Fan CFM Calculator

Calculate the required exhaust fan size (CFM) for bathrooms, kitchens, laundry rooms, attics, and whole-house ventilation. Compare standard, low-sone, humidity-sensing, and combo fan types by cost.

Room Type

Bathroom Area (sq ft)

Ceiling Height (ft)

Pricing (edit to match local rates)

Standard Fan ($)

Low-Sone / Quiet ($)

Humidity-Sensing ($)

Combo Light + Fan ($)

Required CFM

8 ACH rule

Fans Needed

fan

Lowest Cost

$50.00

Standard

Fan Type	Fans & CFM	Estimated Cost
StandardBest value	1 fan @ 64 CFM	$50.00
Low-Sone / Quiet	1 fan @ 64 CFM	$120.00
Humidity-Sensing	1 fan @ 64 CFM	$150.00
Combo Light + Fan	1 fan @ 64 CFM	$100.00

Best Value: Standard — $50.00For your 64 CFM requirement, the Standard fan is the most cost-effective option at $50.00. Select a fan rated at or above 64 CFM for proper ventilation.

Consider a Quiet Fan for BathroomsStandard exhaust fans can be noisy (3-4 sones). Low-sone fans (0.3-1.0 sones) cost more upfront but are much more pleasant for daily use and more likely to be left running long enough to properly remove moisture.

These are estimates based on general ventilation guidelines and ASHRAE standards. Actual requirements vary by local building codes, duct run length, and specific installation conditions. Consult a licensed HVAC contractor for final sizing and installation.