Opening size 40x40 cm and outer frame 52x52 cm) Industrial iron exhaust fan from the KDK brand (model 40GSC) made in Japan ; Brand: KDK (Made in Japan - Osaka, Japan) ; Fan Model: 40GSC ; Voltage: AC220-240V (or AC220-230V depending on frequency) ; Frequency: 50Hz / 60Hz ; Power Consumption: 161-181W (at 50Hz) / 210-214W (at 60Hz) ; Current: 1.1-1.2A (at 50Hz) / 1.0A (at 60Hz)