After October 30, 2023, any representations made with respect to energy use or efficiency of fans and blowers subject to testing pursuant to § 431.174 must be made in accordance with this appendix. Any optional representations of fan energy index in the optional test configuration listed in table 7.1 of AMCA 214-21 (FEIoptional) must be accompanied by a representation of fan energy index in the required test configuration listed in table 7.1 of AMCA 214-21 (FEI).

0. Incorporation by Reference

In § 431.173, DOE incorporated by reference the entire standard for AMCA 210-16, AMCA 214-21, and ISO 5801:2017; however, only enumerated provisions of those documents are applicable as follows. In cases where there is a conflict, the language of this appendix takes precedence over those documents.

0.1 AMCA 210-16:

(a) Section 3, “Definitions/Units of Measure/Symbols”;

(b) Section 4, “Instruments and Methods of Measurement” ;

(c) Section 5, “Test Setups and Equipment”;

(d) Section 6, “Observation and Conduct of Test”;

(e) Section 7, “Calculations” excluding Section 7.9.2, “Conversion to other rotational speeds and air densities with compressible flow” and Section 7.9.3, “Conversion formulae for new densities and new rotational speeds”;

0.2. AMCA 214-21:

(a) Section 2, “References (Normative),” as referenced in section 2.2 of this appendix;

(b) Section 3, “Definitions,” as referenced in section 1 of this appendix;

(c) Section 4, “Calculation of the FEI for a Single Duty Point,” as referenced in section 2.6 of this appendix;

(d) Section 5, “Reference Fan Electrical Power (FEPref),” as referenced in section 2.6 of this appendix;

(e) Section 6.1, “Wire-to-Air Testing at the Required Duty Point,” as referenced in section 2.2 of this appendix;

(f) Section 6.2, “Calculated Ratings Based on Wire-to-Air Testing,” as referenced in section 2.2 of this appendix;

(g) Section 6.3, “Bare Shaft Fans,” as referenced in section 2.2 of this appendix;

(h) Section 6.4, “Fans with Polyphase Regulated Motor”, excluding Section 6.4.1.4, “Requirements for the VFD, if included” and Section 6.4.2.4, “Combined motor-VFD efficiency” as referenced in section 2.2 of this appendix;

(i) Section 7, “Testing,” as referenced in sections 2.2 and 2.3 of this appendix;

(j) Section 8, “Rating Development”, excluding Section 8.2.2, “Separate Fan and Motor Tests” and Section 8.3, “Appurtenances” as referenced in section 2.2 of this appendix;

(k) Annex D, “Motor Performance Constants (Normative),” as referenced in section 2.2 of this appendix;

(l) Annex E, “Calculation Methods for Fans Tested Shaft-to-Air,” as referenced in section 2.2 of this appendix;

(m) Annex G, “Wire-to-Air Measurement—Calculation to Other Speeds and Densities (Normative),” as referenced in section 2.2 of this appendix;

(n) Annex J, “Other data and calculations to be retained,” as referenced in section 2.2 of this appendix; and

(o) Annex K, “Proportionality and Dimensional Requirements (Normative),” as referenced in section 2.2 of this appendix.

0.3. ISO 5801:2017:

(a) Section 3, “Terms and Definitions”;

(b) Section 4, “Symbols, Abbreviated Terms and Subscripts”;

(c) Section 5, “General”;

(d) Section 6, “Test Configurations”;

(e) Section 7, “Carrying out the Test”;

(f) Section 8, “Airways for Duct Configuration”;

(g) Section 9, “Standardized Test Chambers”;

(h) Section 10, “Various Component Parts for a Laboratory Setup”;

(i) Section 11, “Standard Test Configurations”;

(j) Section 12, “Measurements”;

(k) Section 13, “Reference Conditions”;

(l) Section 15, “Calculations”;

(m) Section 16, “Fan Characteristic Curves”; and

(n) Section 17, “Uncertainty Analysis”.

1. Definitions

The definitions applicable to this appendix are defined in § 431.172 and in section 3, “Definitions,” of AMCA 214-21. In cases where there is a conflict, the definitions in § 431.172 take precedence over AMCA 214-21.

2. Test Procedure for Fans and Blowers Other Than Air Circulating Fans

2.1. General.

This section describes the test procedure for fans and blowers other than air circulating fans. In cases where there is a conflict, the provisions in this appendix take precedence over AMCA 214-21. Where AMCA 214-21 refers to Annex A, “Polyphase Regulated Motor Efficiencies (Normative),” of AMCA 214-21, Table 5 of § 431.25 or the currently applicable standards in § 431.25 must be used instead.

2.2. Testing

2.2.1. General.

The fan electrical power (FEPact) in kilowatts must be determined at every duty point specified by the manufacturer in accordance with one of the test methods listed in table 1, and the following sections of AMCA 214-21: Section 2, “References (Normative)”; Section 7, “Testing,” including the provisions of AMCA 210-16 and ISO 5801:2017 as referenced by Section 7 and implicated by sections 2.2.2 and 2.2.3 of this appendix; Section 8.1, “Laboratory Measurement Only” (as applicable); and Annex J, “Other data and calculations to be retained.”

Testing must be performed in accordance with the required test configuration listed in Table 7.1 of AMCA 214-21. The following values must be determined in accordance with this appendix at each duty point specified by the manufacturer: fan airflow in cubic feet per minute; fan air density; fan total pressure in inches of water gauge for fans using a total pressure basis FEI in accordance with Table 7.1 of AMCA 214-21; fan static pressure in inches of water gauge for fans using a static pressure basis FEI in accordance with Table 7.1 of AMCA 214-21; fan speed in revolutions per minute; and fan shaft input power in horsepower for fans tested in accordance with sections 6.3 or 6.4 of AMCA 214-21.

In addition, if applying the equations in Section E.2 of Annex E of AMCA 214-21 for compressible flows, the compressibility coefficients must be included in the equations as applicable.

All measurements must be recorded at the resolution of the test instrumentation and calculations must be rounded to the number of significant digits present at the resolution of the test instrumentation.

In cases where there is a conflict, the provisions in AMCA 214-21 take precedence over AMCA 210-16 and ISO 5801:2017. In addition, the provisions in this appendix apply.

2.2.2 Power Roof Ventilators

Centrifugal Power Roof Ventilators that are both supply and exhaust must be tested in both supply and exhaust configurations as listed in table 7.1 of AMCA 214-21.

2.2.3 Embedded Fans

Embedded fans that are not manufactured in a standalone configuration must be tested in a standalone configuration. If some components of the bare shaft fan are not removable without causing irreversible damage to the equipment into which the fan is embedded, testing must be performed using additional fan components, except for the fan impeller, that are geometrically identical to that of the fan embedded inside the larger piece of equipment for testing.

2.3. Power Supply

Any wire-to-air testing must be conducted at the supply frequency, phase, and voltages specified in this section. The frequency and voltage must be selected in accordance with section 7.8. of AMCA 214-21. Fans and blowers rated for operation for single- or multi-phase power supply must be tested with single- or multi-phase electricity, respectively. Fans and blowers, capable of operating with single- and multi-phase power supply, must be tested using multi-phase electricity.

2.4. Stability Conditions.

The following conditions must be met to establish system stability prior to collecting test data:

(a) Barometric pressure, dry bulb temperature and wet bulb temperature in the general test area must be captured at least every five seconds after the run-in period is completed and the ambient air density calculated from these values shall not vary by more than ±1 percent during verification of fan speed and fan input power stability.

(b) After the fan has been run-in, record the fan speed in rpm and the input power (in horsepower or watts) at least every 5 seconds for at least three 60-second intervals. Readings shall be made simultaneously. Repeat these measurements over 60-second intervals until:

(1) The average fan speed from the last 60-second interval varies by less than the absolute value of 1 percent or 1 rpm, whichever is greater, when compared to the average fan speed measured during the previous 60-second test interval;

(2) The average input power from the last 60-second interval by reaction dynamometer, torque meter or calibrated motor must be ±4 percent, or the average input power by electrical meter must be ±2 percent of the mean or 1 watt, whichever is greater, compared to the average input power measured during the previous 60-second test interval; and

(3) The slopes of a linear fit trendline calculated from the individual data collected for fan speed and input power during at least three 60-second sampling intervals include both positive and negative values (e.g., two positive and one negative slope value or one positive and two negative slope values). If three positive or three negative slopes are determined in succession, additional sampling intervals are required until slopes from three successive sampling intervals include both positive and negative values.

2.5. Sampling Intervals for Testing.

A test measurement must meet the following conditions:

(a) The sampling interval over which average test values are determined shall not exceed 60 seconds;

(b) The average fan speed from the most recent 60-second interval varies by less than the absolute value of 1 percent or 1 rpm, whichever is greater, when compared to the average fan speed measured during the previous 60-second test interval; and

(c) the average input power from the last 60-second interval by reaction dynamometer, torque meter or calibrated motor must be ±4 percent, or the average input power by electrical meter must be ±2 percent of the mean or 1 watt, whichever is greater, compared to the average input power measured during the previous 60-second test interval.

2.6. FEI calculation

The FEI must be determined at every duty point in accordance with Section 4, “Calculation of the FEI for a single duty point,” and Section 5, “Reference Fan Electrical Power (FEPref)” of AMCA 214-21. In addition, the FEI must be rounded to the nearest hundredths place; FEP must be rounded to three significant figures; and all measurements must be recorded at the resolution of the test instrument.

[88 FR 27391, May 1, 2023, as amended at 88 FR 53375, Aug. 8, 2023]