What is an Air Curtain and What is the Purpose of an Air Curtain?
Back in 1888, Theophilus van Kannel invented the revolving door to solve a simple but important problem: keeping unpleasant smells and harmful germs out of buildings when people came and went. It also made life easier—no more needing someone to hold the door open (they say Van Kannel got tired of doing that for his […]
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