Commercial Kitchen Exhaust Calculator

Calculate required exhaust CFM for commercial kitchen hoods based on appliance type, hood type, and ASHRAE/IMC standards.

Length of the exhaust hood canopy.
feet
Width/depth of the exhaust hood.
feet
1 = Wall canopy, 1.5 = Single island, 2 = Double island/backshelf.
Duty: Light = 200 CFM/ft, Medium = 300, Heavy = 400, Extra Heavy = 550.
CFM/ft
Percentage of exhaust provided as makeup air (0.5 to 1.0).

Results

Hood Area-ft²
Required Exhaust CFM-CFM
Makeup Air Required-CFM
CFM per Hood Area-CFM/ft²
References: ASHRAE Handbook - HVAC Applications Chapter 33: Kitchen Ventilation; IMC Section 507: Commercial Kitchen Hoods; NFPA 96