AMCA Publication (R) Field Performance Measurement of Fan Systems AIR MOVEMENT AND CONTROL ASSOCIATION. use of probes capable of indicating both flow direction and velocity pressure. The AMCA Publication ‘Field Performance. Measurements’ and the AMCA. AMCA International has reaffirmed AMCA Publication. , Field Performance Measurement of Fan Systems. Recommendations in this publication may be.

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The equation for fan static pressure is: The fan flow rate is the volume flow rate at the fan inlet density.

AMCA Publication 203 R2007

Determine Ps2 by averaging the pressure measurements at each of four static pressure taps located near the fan outlet. For belt driven fans, the rated fan power input may or may not include belt drive losses. A location for Plane 3 measurements may be obtained by installing ducts on each silencer inlet, as shown in the diagram.

Although Plane 5 is greater in area that Plane 2, the degree of divergence is relatively small. These conversion equations do not account for the effect of the compressibility of the gas stream. Ps3 is determined by averaging the static pressure measurements made in the same traverse.

All of the test measurements and calculations in this method for testing a free inlet, free outlet fan are the same as those required for a fan with a ducted inlet and a free outlet.

If the motor power output is to be estimated by using the phase current method described in Annex K, it is not necessary to measure motor watts; however, it may be necessary to disconnect the drive and measure the no load amps NLA if the motor is not operating at or near its full load point refer to Annex K.


Also, the temperature of the heating coil must be kept constant throughout the test period. At elevated temperatures, the thermometer may have to be shielded to prevent radiation effects from exposed heat sources. Measure td5 in Plane 5.

The intent of this publication is to provide information from which test procedures can be developed to meet the conditions and requirements encountered in specific field test situations. Draw a publiication performance curve from these ratings converted to operation at the test values of fan speed and entering air density.

Because of the wide variety of fan types and systems encountered in the field, Annex A includes examples of a number of different field tests. See Annex P for guidance in locating the publicafion plane in these cases. Each of the procedures requires knowledge of the pressure, dry-bulb temperature and wet-bulb temperature of the air.

Rating Point 1 Fan performance, at standard air density, as supplied by fan manufacturer for rpm. In addition to fans, these equipment assemblies may include any pubblication of combinations of coils, filters, access sections, humidifiers, mixing boxes, dampers, etc.

Measure A4 and A5, the cross-sectional areas of the airways at Planes 4 and 5. Measure the fan speed and the motor amps, volts, and, if possible, watts. The phase current method is convenient and sufficiently accurate for most field tests. Inclined manometers are available in both fixed and adjustable range types.

This consideration arises when a damper, which is not considered a part of the fan is located between a static pressure measurement plane and the fan. Measure td3, tw3, and td4. For fpm velocity and curve T, Figure 7.

Measure td1 and td2. This is particularly important at measurement points near the walls of the airway see Annex A-1A.


These data, which are referred to as typical in that the data and the actual performance of the motor are expected to correspond closely, can usually be obtained from the motor manufacturer. To calculate the Fan Section Static Pressure: Before proceeding with the test, it is essential that all dampers outside air, return air, mixing box, multizone, face and bypass, or volume control be fixed in the positions agreed upon by all interested parties as being applicable for the installation.

Fans connected to motors through belt drives. All of these measurements are used in determining densities at the various planes of interest. When this possibility exists, it is essential pulbication the static pressure in the region of the discharging air be measured, referred to the same 38 atmospheric pressure as used in all other pressure zmca.

For fpm velocity and curve T-U, Figure 7. Also referred to as impact reverse tube, combined reverse tube, and type S tube.

AMCA Publication R – Free Download PDF

In locating Plane 3 downstream of the scrubber, changes in the composition of the air as a result of the action of the scrubber are properly taken into account in the determination of fan air flow rate.

Since the flow at a traverse plane is never strictly steady, the velocity pressure measurements indicated by the manometer will fluctuate. SEF 1 is due to the effect of there being no duct at the fan outlet.