Walk-In Freezer CFM Calculator
Evaporator airflow for a walk-in freezer.
Enter your values
ⓘ Live results
Results
- Evaporator airflow
- 180 CFM
- Equivalent BTU/hr
- 18,000
- Defrost consideration
- Add electric or hot-gas defrost cycle timing separately
Quick answer
Walk-in freezers typically need about 100-140 CFM of evaporator airflow per ton, lower than coolers due to colder, denser air.
CFM = tons x CFM per ton
How to use the Walk-In Freezer CFM Calculator
- 1Determine the freezer's refrigeration load in tons.
- 2Use 100-140 CFM per ton, toward the low end for tightly packed frozen goods.
- 3Check that door strip curtains do not block evaporator discharge.
Worked example
Using the values the calculator loads with:
Inputs
- Refrigeration load1.5 tons
- CFM per ton120 CFM/ton
Results
- Evaporator airflow180 CFM
- Equivalent BTU/hr18,000
- Defrost considerationAdd electric or hot-gas defrost cycle timing separately
Frequently asked questions
Why lower CFM than a cooler?
Colder air is denser and freezer products tolerate less direct high-velocity airflow without freezer burn.
Multiple evaporators?
Common in larger boxes to keep temperature uniform corner to corner.
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.