The plastic fan VK 315 U, 1340m3 / h of durable ABS plastic is compatible with a flexible and rigid air duct with a diameter of 315mm. The built-in thermostat will simplify the ventilation of your rooms. Set the required temperature manually directly on the fan. If the temperature rises by 2 degrees, the engine will start to work faster. When the room cools down, it switches to a lower speed.