Dish Room Exhaust Calculator
Exhaust airflow for a commercial dish washing room.
Enter your values
ⓘ Live results
Results
- Total exhaust
- 660 CFM
- Dish machine hood
- 300 CFM
- General room exhaust
- 360 CFM
- Makeup air
- 561 CFM (tempered in cold climates)
Quick answer
Commercial dish rooms typically need 200-500 CFM of dish-machine hood exhaust plus general room exhaust of about 1-1.5 CFM per square foot for humidity control.
Total CFM = dish machine hood CFM + area x general rate
How to use the Dish Room Exhaust Calculator
- 1Get the dish machine's rated hood exhaust from its data plate or spec sheet.
- 2Add general room exhaust based on floor area for humidity control.
- 3Sum both and provide matching tempered makeup air.
Worked example
Using the values the calculator loads with:
Inputs
- Dish machine hood exhaust300 CFM
- Dish room area300 sq ft
- General exhaust rate1.2 CFM/sq ft
Results
- Total exhaust660 CFM
- Dish machine hood300 CFM
- General room exhaust360 CFM
- Makeup air561 CFM (tempered in cold climates)
Frequently asked questions
Why is humidity control important here?
Excess steam condenses on ceilings and walls, promoting mould and slip hazards without adequate exhaust.
Does the dish machine hood need grease-rated duct?
Usually a Type II (moisture/heat) hood and duct suffice unless there is significant grease-laden vapour present.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.