Noise and performance measurements were made on three 36 inch (914 mm) diameter variable pitch axial fans with nominal hub diameters of 14, 17 and 26 inch (360, 430 and 660 mm). Each of the three fans was tested at four blade angles providing “twelve” test fans. The twelve fans were tested using ten test-wall positions designed to simulate the effect of installing fans in close proximity to the walls of an inlet plenum. This test program was designed to meet the requirements of ASHRAE Research Project 1010, “Inlet Installation Effects, Air and Sound, on Vaneaxial Fans.” The measurements were made at the Air Movement and Control Association International (AMCA) laboratories in Chicago.

The 120 tests of this project covered the fan flow-rate range from free delivery to near shutoff with data collected at 9 to 11 test points or determinations for each test. The 120 tests yielded 120 fan performance curves, 1200 fan noise measurements, 120 Reference Sound Source (RSS) measurements and 120 test room background (BKG) measurements. Figure 1 describes the test fans and the test wall positions. The test fan sizes are identified as 36x14, 36x17 and 36x26 and the wall positions are identified as WP1 through WP10 in this report. Space limitations in the original test coding required the use of a single digit for wall position so the “1” was dropped from position 10 and that position was listed as “0” in the test data and results tables.

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