Instrument Cooling Fans Brand: JAINSON Sizes and specifications: Sr # Description Rated Voltage Current Power RPM CFM 1 4″ (120x120x38mm) Square Fan 230V AC 110mA 20W 2550 109 2 6″ (172x150x51mm) Oval Fan 230V AC 210mA 40W 2650 197 3 8″ (220x220x60mm) Oval Fan 230V AC 325mA 46W 2400 360