Metric conversion Factors for Fan Application per AMCA Standard
September 1st, 2004
| Quantity | "English" Unit | Metric Unit | Conversion Factor |
| Volume | cubic feet per minute CFM |
cubic meter per second m^3/S cubic meter per minute m^3/min cubic meter per hour m^3/hr liter per second l/s |
0.00047195 0.028317 1.6990 0.47195 |
| Pressure | inches of water gauge in. wg |
pascal Pa or N/m^2 millimeters mm |
248.36 25.4 |
| Power | horsepower hp, BHP |
watt W or J/s Kilowatt kw |
745.70 0.7457 |
| Torque | pound-inch lb-in. |
newton meter N-m |
0.11298 |
| Density | pounds per cubic feet lb/ft^3 |
kilogram per cubic meter kg/m^3 |
16.018 |
| Speed | revolutions per minute RPM |
revolution per second rps |
0.01667 |
| Velocity, Tip Speed | feet per minute fpm |
meter per second m/s |
0.00508 |
| Dimensions | inch in. |
millimeter mm |
25.4 |
| Area | square foot square inch |
square meter m^2 square millimeter mm^2 |
0.0929 645.16 |
| Length | foot foot yard |
millimeter mm meter m meter m |
304.8 0.3048 0.9144 |
| Mass (weight) | ounce pound |
gram g kilogram kg |
28.350 0.4536 |
| Velocity | feet per second feet per minute miles per hour |
meters per second m/s meters per second m/s meters per second m/s |
0.3048 0.00508 0.44704 |
| Volume (capacity) | cubic inch cubic yard gallon (U.S.) gallon (imperial) |
cubic centimeter cm^3 cubic meter m^3 liter l liter l |
16.3871 0.7646 3.785 4.546 |
Multiply "English" Unit by conversion factor to obtain Metric Unit.
For example: 5000 CFM x 0.00047195 = 2.360 m^3/s
Divide Metric Unit by conversion factor to obtain "English" Unit.
For example: 62.1 Pa / 248.36 = 0.250 in. wg
