Windows Exhaust fan:Pleasing in appearance, surface gloss, and ultra-quiet, energy saving design, long life, and ease of installation. Closed Extractor Detail Model No KHG-100-A KHG-150-APanel Size 150*150mm /195*195mm Holes Diameter φ110mm φ150mm Voltae/HZ 110 220v 110 220v Power 15w 20w Duty At Free DischargeI 1.44 m3/min 1.8 m3/min Usable Area 3-4 m2 4-6 m2 Conduit Joint Diameter 105mm 150mm PriceBrand Dingge/Baer Dingge/Baer