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In a commercial hood the make up air is like a non powered vent that provides fresh air above the appliance, the negative pressure from the exhaust causes the fresh air flow. The idea of this is to minimize exhausting heated or air conditioned air. I am sure if you have a window open near the hood you would have a similar effect.
Sorry to hear about your misfortune. I also have the handler and it certainly makes it easy to move the egg. One question why do you move it inside, mine has been outside through a couple of winters and seems no worse for wear.