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Back flow valve of OK series for domestic axial fans with flange diameter of 100, 125 and 150 mm.
It provides protection against all kinds of odors that may filter through air holes. In order to improve elasticity and flexibility of back flow valve,
the material of leaves was replaced from ABS-plastic to plastic polypropylene. This fact increased durability of products, which is important for constant
opening / closing of back flow valve during fan operation.
Details about products in catalog: here.