SAFETY IS OUR PRIORITY - Fireproof/rust resistant high-tech aluminum and Metal case reduces the possibility of damaging. Easy to clean and protect your healthy life. This air curtain generates powerful air stream but running quiet. It is to keep the flying insects out, perfect for office, restaurant, donuts shop or residential door entrance or drive-thru window. It can be operated at the touch of a button, it has high and low speed switch functions. This machine adopting optimized electrical machinery, it operates reliably, and runs safely.