What are the disadvantages of air curtains?

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Air curtains have several disadvantages that users need to take into account. Most importantly, they do not function as a solid door would and can manage to close off roughly 80% of air exchange between both environments. This means some conditioned air can escape, especially for extreme weather. They work best in open areas with frequent activity; if doors are opened infrequently, plastic curtains and traditional doors may be a better option. Moreover, air curtains do consume electricity and add to energy costs, especially when left in use at all times. Some units are also prone to producing moderate sounds, which addition may be an inconvenience in offices or hospitals. Without regular maintenance, used units also become less efficient and noisier with time. Finally, air curtains can lose their effectiveness if the size is not suited for the doorway.

Q. What are the disadvantages of air curtains?

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