They do indoor and outdoor ones. Outdoor ones are stronger and waterproof.
I used an indoor one in my barn before I dug my inspection pit. It’s like a big drive in frame tent and fantastic as a glorified dust cover, no faffing about taking a cover on & off, just unzip the door and go. They do inflate, supposedly to keep a flow of air for ventilation, but I found that after a cold spell followed by warmer weather, condensation formed as the warm moist air being blown in condensed on the cold metal of my car. Just switched the fan off and used it as a zipped up frame tent after that.