CFM to CMH Converter for HVAC Airflow Calculations
To convert cubic feet per minute to cubic metres per hour, multiply your CFM value by 1.6990108. Managing HVAC airflow conversion UAE projects requires precise figures because regional technical schedules rely on metric units. Using a reliable CFM to CMH converter UAE applies the standard CFM to m3/h conversion factor of 1.6990108. MEP engineers convert CFM to CMH when reviewing datasheets for sizing supply branches, terminal units, and duct layouts across commercial developments in the region.
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CFM to CMH formula
m³/h = CFM × 1.6990108
CFM = m³/h ÷ 1.6990108
The factor is 1.6990108 m³/h for each 1 CFM. Going the other way, 1 m³/h is 0.58857778 CFM.
CFM to CMH reference table
| CFM | m³/h |
|---|---|
| 100 | 169.901 |
| 200 | 339.802 |
| 400 | 679.604 |
| 500 | 849.505 |
| 800 | 1,359.21 |
| 1,000 | 1,699.01 |
| 1,500 | 2,548.52 |
| 2,000 | 3,398.02 |
| 3,000 | 5,097.03 |
| 5,000 | 8,495.05 |
Where this conversion is used
Fan, AHU and FCU catalogues in India and the Gulf often list airflow in CMH, while US catalogues, duct sizing charts and many diffuser selection tables use CFM. You need this conversion when you compare equipment submittals from different manufacturers, read a design drawing in one unit and a catalogue in the other, or fill in an air balance report for a consultant who asks for metric units.
Worked example
An air handling unit is scheduled for 2,000 CFM of supply air and the supplier's catalogue lists its models in CMH.
2,000 CFM × 1.6990108 = 3,398.02 m³/h
Pick the catalogue model that delivers at least 3,398 m³/h at the required static pressure.
Common mistakes
- Mixing up CMH and CMM. CMM is cubic metres per minute, so the CMH figure is 60 times the CMM figure for the same airflow.
- Rounding the factor too early. Carry at least four significant figures through the calculation and round only the final airflow.
- Treating standard and actual airflow as the same thing. CFM to CMH is a pure volume conversion and works at any temperature, but SCFM and ACFM describe different air conditions and are not interchangeable.
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Related HVAC calculations
Frequently asked questions
What is the procedure to change CFM into metric airflow units?
To perform this calculation, multiply the given cubic feet per minute figure by 1.6990108 to get cubic metres per hour. This standard CFM to m3/h conversion ensures compliance with regional mechanical design submittals.
Are CMH and m³/h considered identical measurements?
Yes, CMH and m³/h represent the exact same volumetric flow rate unit of cubic metres per hour. Engineers frequently use both abbreviations interchangeably when specifying equipment capacity.
How many CFM are contained within a single CMH?
One cubic metre per hour equals 0.58857778 cubic feet per minute. Applying this reciprocal factor allows quick verification of imported fan performance data against local schedules.
How is airflow calculated when sizing air handling units?
When evaluating CFM to CMH for AHU selections, engineers utilize a trusted CFM to CMH converter to match cooling coil requirements. This ensures proper thermal exchange rates and prevents under-sizing in large commercial spaces.
Why is metric airflow conversion important for fan coil units?
Using accurate CFM to CMH for FCU ratings helps consultants align thermostat settings and chilled water flow rates with manufacturer specifications. Proper unit matching eliminates excessive noise and maintains indoor comfort.
How does airflow unit conversion impact duct design?
Applying correct CFM to CMH for duct sizing data prevents static pressure calculation errors across complex trunk layouts. A dependable CFM to CMH converter guarantees that velocity pressures remain within acceptable limits.
What mathematical expression is used for calculating metric airflow?
The standard CFM to m3/h formula multiplies total CFM by 1.6990108. Alternatively, an online CFM to CMH conversion calculator automates this step for extensive MEP estimations.
How do you reverse the calculation from metric to imperial units?
The reverse CMH to CFM formula divides metric flow by 1.6990108 or multiplies by 0.58857778. This helps verify CFM to cubic metres per hour parameters when dealing with international equipment vendors.
What formula determines metric volumetric rates from imperial values?
The official CFM to m3/h conversion formula multiplies CFM directly by 1.6990108. Proper airflow conversion from CFM to CMH prevents discrepancies when coordinating mechanical layout drawings.
How do velocity parameters relate to volumetric airflow calculations?
Checking airflow CFM to L/s alongside metric rates ensures multi-unit compatibility. Furthermore, evaluating fpm in air velocity calculations, where air velocity fpm equals CFM divided by duct cross-sectional area in square feet, helps maintain proper friction rates.
Can I use the converted figure for duct sizing and velocity checks?
For CFM to CMH for duct sizing, use the converted figure only as the airflow input, not as the duct size itself. Air velocity FPM is calculated as CFM divided by duct cross-sectional area in square feet. FPM in air velocity checks describes speed, while CFM and CMH describe volumetric airflow.
For airflow CFM to L/s, use the CFM to L/s option in the related converters list. To convert velocity units, use the FPM to m/s converter. If a duct schedule also lists pressure in inches WG, use the Inches WG to Pa converter.