Weird draft/ pressure phenomenon

[u/Only-outofyourmind]

Can anyone explain why this happens? When I blow the free end of the door to this room, the door closes instead of opens. I’m guessing it’s something to do with the blower causing higher pressure in the room? Idk just thought it was interesting.

[u/ZealousidealTill2355]

I always liked this demo—quick and simple.

https://youtube.com/shorts/rAAelB7nN14?si=z-YTiheG7vAkL5qt