KRZ is used in circular ventilation ducts. The gravity shutters (grill) is fixed at the exhaust point of the ventilation duct. Preventing back drafts and unpleasant external odours. It protects against precipitation whether the gravity shutters are open or closed. It is installed in a vertical position and the shutters should be directed downwards. At diameter's 100/125 mm the use of a rectangular duct adapter is possible allowing flat ducting to be connected
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