Metal connector with protection against back draught D125

Back flow valve with 2 spring-loaded plates is designed to prevent air flow in the opposite direction when the ventilation system is turned off.
Valve plates are opened under the pressure created by the air flow and closed by a spring.
Valve case is made of zinc-plated steel and plate is made of sheet aluminum.
Valve is equipped with a special gasket of the foam rubber to reduce noise during operation of the valve and to ensure its integrity.
Valve is intended for connection with round air ducts. Fastened with clamps.
During the valve installation in ventilation system, the axis must be positioned vertically

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