ZPC overpressure valve. The butterfly valve with back draft prevents unwanted air flow.

• Spring blade mechanism, non-adjustable, blades are opened by air pressure and closed by a spring
• The body is made of galvanized steel sheet, the valve flap is made of anodized aluminum.
• When installed horizontally, the flap axis must be in a vertical position.
• Install the check valve in the ventilation system in the direction of air flow.