This innovative window features a built-in, energy-efficient fan that automatically detects temperature and humidity levels, ensuring optimal airflow and ventilation in the kitchen. Suitable for Kitchens, Utility Rooms, Offices and larger Bathrooms. 64 Litres per second, 220m3 per hour extract capacity. 40dB(A) @ 3m . 25w power consumption. Automatic electrically operated back draught shutter with silent operation, closes automatically when fan is switched off. This fan can also be installed through a wall or on a ceiling. If installing in glass requires a 184mm diameter hole. The glass thickness can be 4 to 22mm thick although you can use longer screws of the same gauge to bridge larger gaps if required. Supplied pre-flexed. This fan is normally wired up to a nearby Spur Connection Unit, or lighting circuit or a 13 amp plug can be fitted (requires 3 amp fuse). It is single speed. Dimensions: 205mm high x 205mm wide x 101mm deep (inside) and 25mm (outside - if in glass). The three pictures above show the front, side and rear of the unit.