Try to install an air curtain for a swinging door? The door swings in and out a few times then settle to stop. You must get this circuit kit to avoid the motor to be on and off during the door swinging.
With 2-3 seconds shutoff delay, the air curtain won't shut off immediately when the door isn't fully settled to stop and close in order to protect the motor.
Also, with 2-3 seconds shutoff delay, the air curtain won't shut off immediately to prevent the flying insects getting in if the door isn't fully close.
Convert your air curtain or appliance to be magnetic switch controlled. 120VAC 15A max or 1800W max, single phase only. Not for all models of air curtains, please review it carefully before buying. Recommend to be installed by a licensed electrical technician. Not responsible for any damage caused from miswired or shorted.
Patent pending. 3 pieces included: circuit board, magnetic switch and metal cover.