Our Products EC Radial Blowers EC Radial Blowers, also named Condensing boiler fans, are mainly used for floor-stand condensing boilers or water steam boilers.Product FeaturesImproved efficiency and housing/impeller design through unsteady CFDOver-voltage/reverse polarity/integrated locked-rotor and thermal overload protectionInfinitely variable speed controlOptional control signal: PWM/0-10VEMC immunity to interference FE175-240 FE170-410 FE170H-410 FE250-1150 FE250-1500