Sizing an air-to-air heat exchanger means converting between SI and imperial specifications: airflow in m3/h or CFM, duty in kW or BTU/h, pressure drop in Pa or inWC, and face area in m2 or ft2. This converter handles all five live as you type, so a European datasheet and a US fan curve can be compared directly. All calculation runs in your browser; no data is uploaded.
For air-to-air heat exchangers, HVAC and ventilation work — convert airflow, power, temperature, pressure and area between SI and imperial, live as you type.
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Specifying a heat exchanger?
Pair these conversions with our product pages to size the right unit, or talk to our engineers about your project.
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How to use this tool in a specification
These results are a first-pass screening aid. Confirm the duty point against certified test data (EN 308 / AHRI 1060), the applicable energy code, and the manufacturer datasheet before issuing a purchase specification. For a verified sizing, send us your airflow and temperatures.
Frequently asked questions
How do I convert m3/h to CFM for airflow?
Multiply cubic meters per hour by 0.5886 to get cubic feet per minute (1 CFM = 1.699 m3/h). Our converter does this instantly as you type.
What is 1 kW in BTU/h?
1 kilowatt equals 3412.14 BTU per hour. Enter a value in either box and the converter shows the equivalent in the other unit.
How do I convert Celsius to Fahrenheit?
F = C x 9/5 + 32. For example 20 C is 68 F. The converter handles both directions automatically.
Why convert Pa to inWC for fans and filters?
Pressure drop across heat exchangers, filters and fans is quoted in Pascals (SI) or inches of water column (imperial). 1 inWC = 249.09 Pa. Converting keeps specs comparable across datasheets.
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Related: exchanger type comparison, 선정 가이드, pressure drop explained · all heat recovery tools.