Stainless steel air curtain.

Installing air curtains in cold storage facilities.

Cold-storage facilities without an air curtain increase the inside temperature
of their cool rooms by up to 5 degrees, this is a very good reason to install an appropriate air curtain.
If the door is left open for five minutes, the temperature inside the cool room will go up by 10 degrees plus.
When an air curtain is installed the temperature goes up by only approx. 2 degrees. 
It cost up to 50% less in energy costs to reduce the inside temperature to -5 degrees with an appropriate air curtain.