OPK-M is an electric motor driven valve is controlled air for use in central air systems for ventilating rooms where you want to force ventilation, eg in bathrooms, kitchens, basement rooms etc. The valve opens electrically which will increase the air flow by a factor of 2-6 times. After the electricity is switched off, the valve automatically returns to its basic position (basic air volume mode). The design of the motor driven valves and a gasket of moltoprene prevents soiling. All components are designed for use in harsh environments and are not affected by, for example, moisture or dust.