VEVOR Air Curtain 59", 2 Speeds Commercial Indoor Air Curtain, CE Certified, 1113 CFM Air Volume with 2 Easy-Install Micro Switch(Limit Switch), 110V Unheated Tested to UL Standards

Yes, it can be installed outside over an exterior entrance door.

No, it can't be mounted in a walk-in cooler.

A 3-meter door requires two of these. They need to be installed along the upper edge of the door.

It does not have a remote control and cannot be opened remotely. However, with a well-equipped travel mechanism, the air curtain machine can be automatically opened when the sliding door is opened.