Product: Bi-directional Exhuast fanVoltage: 220V/50HzPower: 20W(4 inch); 40W(6 inch)Air volume: 130m³/H (4 inch); 310m³/H (6 inch)Machine size: 150x150x100mm ; 200x200x150mm 1 leadership two-way exhaust fan: could be out of the air / can be in the air / remote control, stable two-way effective ventilation air volume, low noise, quiet and effective ventilation3 Waterproof rating, no worry of every single day splashing, no fear within the bathroom. We have three model for this product : Intake fan / Exhaust fan/ Bi-directional ventilation fan confirm the mannequin you're purchasing when putting an order.