North American Blower Ratings
Sheet 2000-13
AMCA (Air Moving and Conditioning Association) has developed test procedures which are recognized in the industry but which, unfortunately, are not applicable to most of North American's relatively high pressure turbo blowers. Consequently, Fives North American Combustion, Inc. continues to use its own comparable testing procedure, described below. As a check, a North American 8 osi blower of large size (one of the North American blowers which is suited to the AMCA test procedure) was tested by both Fives North American Combustion, Inc. and AMCA procedures. The comparable results obtained validated Fives North American's test procedure. To test blower performance, Fives North American connects the blower discharge to a drum of relatively large diameter, and with multiple calibrated holes in endplate. The blower is started, and the holes are opened, several at a time, until the motor is fully loaded. Data is taken at each step. The large drum converts velocity pressure to static pressure, which is measured along with drum air temperature, barometric pressure, electric power, and impeller speed. Values obtained are then corrected to standard conditions (29.92 inches Hg and 70°F, or 0.075 lb/ft 3 density air), and (total) pressure, horsepower and impeller speed are plotted against corrected air flow, resulting in a typical performance curve.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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