Mars Air Door J0021 Magnetic Switch with Controller and Adjustable Time Delay, for 120V Air Curtains, 208V

Magnetic switch with controller and adjustable time delay for 120V or 208/220V single phase air curtains. Non-impact switch with a separate controller. Adjustable time delay allows operator to choose an amount of time before the air curtain shuts off, allowing stragglers through the door without having the unit shut on and off repeatedly.