APPLICATIONS:Combined supply and extract air flow tricks for different premises where excessive air flow at relatively low formula resistance is required. MOTOR:The motor is equipped with ball bearings. SPEED CONTROL:Both comfortable and step velocity control is played with the thyristor or autotransformer controller. Several fans could be related to no less than one controller in case the total strength and dealing latest do not exceed the rated controller values. Mounting:fan is installed into the duct via strategy of clamps or immediately contained in the wall. Colour: Black Material: iron equipment contents: 1 * Exhaust fan Only the above kit content, varied merchandise are usually not included. Note: Light capturing and assorted displays may cause the colour of the item in the picture a bit diverse from the real thing. The length allowed error is +/- 1-3cm.