Free Tool
m³/h to CFM Calculator
Convert fan airflow between m³/h and CFM instantly, then see Proventofan fan sizes with comparable published free-air ratings. Enter a value in either field below.
m³/h × 0.5886 = CFM, or CFM × 1.699 = m³/h.
Fan sizes with comparable catalog airflow
Note: These are published free-air catalog ratings (AC axial: 50/60Hz free-air figures; EC/DC/AC centrifugal: maximum free-air airflow only, not a confirmed operating range). None of this is installed airflow at your system's static pressure — confirm against the fan curve before ordering.
m³/h, CFM, and m³/min: The Three Units You'll Run Into
If you're comparing fan specs from different suppliers, m³/h is usually the first number you need to translate, but it should not be the only number you trust.
CFM (cubic feet per minute) is the airflow unit you'll see on most US and Canadian fan specs. m³/h (cubic metres per hour) is what you'll see on spec sheets from manufacturers in China, Germany, Taiwan, and most of Europe — it's the default in any market that uses SI units, which is most of the world. If a supplier quotes you 800 m³/h, that's roughly 471 CFM: the number is larger because the time window is longer (one hour vs one minute) and the volume unit is larger (one cubic metre is about 35.3 cubic feet).
m³/min is where people get caught out. Some manufacturers, particularly in Japan, use m³/min instead of m³/h. The units look almost identical written down. They are not — one cubic metre per minute equals 60 cubic metres per hour. A requirement of 20 m³/min equals 1,200 m³/h, not 20 m³/h — confusing the two units creates a 60× sizing error, easily large enough to leave an enclosure without nearly enough airflow. If a spec sheet uses m³/min, multiply by 60 to get m³/h before you compare anything.
| Unit | Region | Time base | Conversion |
|---|---|---|---|
| CFM | North America | Per minute | × 1.699 = m³/h |
| m³/h | International (SI) | Per hour | × 0.5886 = CFM |
| m³/min | Japan, some Asia | Per minute | × 60 = m³/h |
Mental shortcut for quick estimates: divide m³/h by 1.7 to get a close CFM approximation (error under 0.6%) — precise enough for an initial screening or a phone-call sanity check. For a formal quote or final spec, use the calculator above.
What Does the m³/h Number Actually Tell You?
m³/h is not a cooling capacity rating. It tells you the volume of air moved, not the temperature drop or the heat removed. For that you need the heat load, the system resistance, and the fan curve together, not the m³/h figure on its own.
Don't compare an axial fan to a centrifugal fan by free-air airflow alone. As a general rule, axial fans lose airflow faster as resistance increases, while centrifugal fans tend to hold up better under pressure — but the exact behavior depends on the specific impeller and housing design, not just the fan type. An axial fan and a centrifugal fan both rated at the same m³/h can behave very differently once real system resistance (filters, guards, ductwork) is in the picture; check the published P-Q curve for the actual operating point rather than assuming from the general rule. Treat the airflow number as a screening value, not a final selection result.
Two situations where this plays out in practice. Sizing a small industrial control cabinet with a moderate heat load — an axial fan around the 120mm frame size is a reasonable starting point; a denser cabinet or a heavier heat load shifts you toward larger axial frame sizes. For a bigger job, like cooling an industrial machinery enclosure or a rack system with real heat load, you're often looking at a centrifugal fan class entirely, not just a larger axial fan — centrifugal designs hold airflow better against the higher resistance those systems usually present. Either way, "is X m³/h enough?" isn't a complete question on its own: enough at what system resistance, and at what operating point?
One thing the spec sheet won't tell you: the m³/h figure on a fan spec sheet is measured under free-air conditions, meaning near-zero static pressure. Once you install the fan into a real system, actual delivered airflow will be lower. For a full explanation of how much airflow drops in a real system, see what is airflow in a cooling fan.
How to Use m³/h When You're Comparing Fans
- 01
Confirm the Unit Before You Compare
Check what unit the spec sheet actually uses first. m³/h and m³/min look almost identical but differ by a factor of 60. If one supplier lists CFM and another lists m³/h, convert before comparing — the calculator above handles this instantly.
- 02
Match the Number to Your Application Range
Use the catalog matches above as a reference frame. If the m³/h figure on a quote sits well outside the published free-air rating for the stated fan size, either the spec is wrong or the fan type is different from what you assumed. This isn't a full selection calculation — it's a sanity check to catch obvious mismatches before shortlisting.
- 03
Ask for the P-Q Curve If It's Missing
If a spec sheet gives you an m³/h figure but no performance curve, you're only seeing part of the picture. Consult the available P-Q curves on the relevant Proventofan product page, or request performance data for your operating point — for guidance on reading those curves, see our fan curve guide.
None of this guarantees you'll end up with the best fan. It just keeps you from picking the wrong one over a unit mix-up or a missing data point.
Proventofan Ranges Covered By This Calculator
The catalog matches above are pulled from these four ranges. Browse full specifications, curves, and drawings on each product page.
AC Axial Fan
60mm to 280mm, Plastic or Metal Blade
View range
EC Centrifugal Fan
133mm to 560mm, built-in speed control
View range
DC Centrifugal Fan
133mm to 450mm
View range
AC Centrifugal Fan
133mm to 372mm
View range
Full Axial Fan Range
AC, DC and EC axial fans in one place
View range
Full Centrifugal Fan Range
AC, DC and EC centrifugal fans in one place
View rangeNeed Help Checking a Fan Spec?
If your supplier's datasheet lists airflow in m³/h, CFM, or m³/min and you're not sure how the numbers compare, send us the spec sheet. We can review the airflow range, fan curve, voltage, size, and installation conditions before you shortlist a model.
Frequently Asked Questions
What is m³/h in a fan specification?
m³/h stands for cubic metres per hour. It is a commonly used metric unit of volumetric airflow, measuring the volume of air a fan moves in one hour. You'll see it on fan spec sheets from manufacturers in Europe, China, Taiwan, and most markets outside North America.
How do I convert m³/h to CFM?
Multiply m³/h by 0.5886 to get CFM. For a quick mental estimate, divide m³/h by 1.7 — the error is under 1%, close enough for initial screening. For exact figures, use the calculator on this page.
Is m³/h the same as m³/min?
No. m³/h is cubic metres per hour; m³/min is cubic metres per minute. One m³/min equals 60 m³/h. Some manufacturers, particularly in Japan, use m³/min in their datasheets. Always check the unit before comparing figures from different sources.
Why does the m³/h on the spec sheet not match real-world performance?
Spec sheet airflow figures are measured under free-air conditions, where the fan faces near-zero resistance. In a real installation with filters, guards, ductwork, or enclosure walls, resistance increases and actual airflow drops below the rated figure. See our guide on what is airflow in a cooling fan for a full explanation.
What m³/h do I need for an electrical enclosure?
Not by airflow alone. For enclosure cooling, heat load, system resistance, and the allowable temperature difference between inside and outside the enclosure matter more than the m³/h number printed on the datasheet. As a rough starting point, some 120×120×38mm AC axial models publish free-air ratings around 165-189 m³/h, which can suit a small control cabinet with modest heat load; higher density or more heat pushes you toward larger frame sizes. For a full selection calculation, see our fan CFM calculation guide.
References
- ANSI/AMCA Standard 210-25 / ASHRAE 51-25: Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating (approved 2025-05-19)
- ISO 5801:2017: Fans — Performance testing using standardized airways (reviewed and confirmed 2023)
- Bureau International des Poids et Mesures (BIPM): The International System of Units (SI), 9th edition (2019)
Disclosure: This calculator is built and maintained by Proventofan, an industrial cooling fan manufacturer. Product matches shown are pulled from Proventofan's own catalog, not an independent comparison across brands. Technical content is based on published industry standards and engineering practice. For application-specific selection advice, contact the Proventofan engineering team.
Disclaimer: The m³/h-to-CFM unit conversion itself is a fixed volumetric ratio and does not depend on air density, temperature, or altitude. Those conditions can affect a fan's actual performance and the airflow delivered at the system's operating point, which the conversion alone does not capture. Product parameters are as stated on Proventofan official spec sheets; product data verified September 2026. Free-air figures shown here do not account for system static pressure — confirm against the fan curve before ordering.