Air curtains are products installed on doors or sides, which serve to block the exchange of large amounts of heat between indoor and outdoor air through the doors.

2. There are heated and non-heated air curtains. If primarily used during winter to block cold outdoor air from entering the room and to provide additional heating to the lobby, choose a heated air curtain. If mainly used in summer to block hot outdoor air from entering the room, opt for a non-heated air curtain.

3. The heated air curtains come in electric, steam, and hot water heating types, with increasing procurement costs but decreasing operating expenses in that order.

4. When selecting an electrically heated model, make sure to determine the type of power supply and electrical load at the site.

5. The general rule is to select a top-blow model for installations under 4 meters in height, and a side-blow model for those above 4 meters. Then, choose within the finer category based on the actual working conditions.

6. Preferably, lower installation heights for top-blow models, provided on-site conditions permit, and select within the subcategory based on the installation height.

7. The general principle is that the length of top-blowing machine models or the total length of side-by-side installations should not be shorter than the width of the door opening, and the height of side-blowing machine models should be equal to or higher than the door opening.

8. Select the suitable control method as needed; it is recommended to purchase from the original manufacturer.