Kitchen Ventilation Makeup Air Calculator

Size makeup air units based on exhaust CFM, pressurization balance, and climate heating requirements.

Total Exhaust CFM

Makeup Air % of Exhaust

Winter Design Temp (°F)

Supply Air Temp (°F)

Tab to move between fields

Makeup Air CFM

3,400

Pressure Deficit (CFM)600

Negative Pressure (%)15

Heating Capacity (BTU/hr)201,960

Est. Monthly Heating Cost ($)$727

MAU Fan HP1.25

MAU Duct Diameter (in)26

Pressure StatusSlight negative - ideal for kitchen isolation

How to Use This Calculator

Enter the total exhaust CFM from all kitchen hoods.
Set makeup air as a percentage of exhaust (80-90% is typical to maintain slight negative pressure).
Enter the winter design outside temperature and desired supply air temperature.
Review makeup air CFM and heating BTU/hr to size the makeup air unit.
Use the estimated monthly heating cost for utility budget planning.

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