Combined supply and extract ventilation systems for various premises where high air capacity at relatively low system resistance is required. OV1 fans can be used for the direct exhaust of air. OV1 and fans can be mounted onto the external walls. The fan casing is made of steel with polymeric coating.Single-phase asynchronous motor is equipped with thermal overheating protection with automatic restart as well as ball bearings for long service life. Both smooth or step speed control is performed by means of the thyristor or autotransformer controller. Several fans can be connected to one controller under condition that the total power and operating current do not exceed the rated controller values. The fan is installed on the wall surface by means of square mounting plate. The fan is powered through the remote terminal box. Power supply and installation shall be performed in compliance with the manual and wiring diagram on the terminal box. The item "Wall Mounted Extractor Fan Metal Axial Ventilation Exhaust Blower 4 Sizes OV1" is in sale since Tuesday, March 29, 2016. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Indoor Air Quality & Fans\Extractor Fans". The seller is "apuk_limited" and is located in London, Essex. This item can be shipped worldwide.