The fan impeller shall be constructed of steel to ensure the rigidity at fan maximum speed. The impeller shall be statically and dynamically balanced to Level G2.5 as per AMCA204 standard.
The fan shall be tested in accordance with AMCA Standard 210 and 300. The manufacturer must own the production license for industrial products and ISO9001 quality system authentication.
Fan housing shall be constructed of cold rolled steel. The surface shall be anti-corrosion treated, and the flange shall be fabricated from the casing material for strengthening. The housing thickness shall be adequate to ensure the structure rigidity after motor installed.
Motor Chamber with Cooling System
Motor shall be installed in a special motor chamber, which isolates the motor from the exhaust air stream to avoid the influence of high air temperature. This chamber shall have special air channel, suck in fresh air from outside of the fan to cool the motor.
Motor shall be carefully matched to the fan load, IP54, and insulation class F. Motor bearings shall be lubricant ball type. Motor and drives shall be out of the air stream to avoid grease or dirt accumulation.
Fire fighting Certification (Only for smoke removal duty
The fan shall be tested OK in complying with the General Usage Axial Fan technical Specification (China National Standard JB/T 10562-2006). A test report issued by licensed authorities shall be provided. The fan must be tested according to China National Standard GA 211-2009, Fire Fighting Smoke Removal Fan High Temperature Testing Method, running continuously over 30 minutes when the main duct air temperature is 280 degrees centigrade. The high temperature resistance character must be qualified by presenting an official certificate.
Fan surface shall be polished and cleaned up to remove particulates, welding slag, burrs, sharp edge, iron, oil, then epoxy coating [options: colour changes are available], fan surface shall be free of sags, wrinkle, blisters, exposed metal or peeling after coating. It shall be no corrosion and rust at least 10 years in allowable working condition.
Permanently fixed aluminum nameplate shall be fixed on fan body clearly display fan mark, product model and serial number (i.e.: unique ID for each fan), so that the customer can use this number to find out the parts used.