Why does warm air blow down on you when you exit some buildings through automatic doors in the winter?
In: Technology
It’s an “air curtain”. A powerful fan blows a wall of air across the opening to reduce energy loss. Especially useful for doors that are used constantly such as supermarket entrances or a walk in cooler.
They are air curtains. The concept is that they are using airflow to prevent the warm inside air from escaping out and the cold outside air from coming inn. And just in case some outside air does get inn they make sure the air that forms the inside part of the air curtain is kept at a higher temperature then the rest of the store so that it will heat up any of the cold outside air coming inn to room temperature.
A fun note is besides the main reason, the air curtain is strong enough to keep bugs from flying in aswell.
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