system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How exactly do vacuums suck up air?

All I see is a spinning cloud of dust. How do vacuum cleaners and chambers work?
gpt
We think of fans as blowing air, but if you look from the back side of the fan, it is sucking air in. Hold a candle behind the fan and you can see the smoke get sucked into the fan. All fans suck on one side and blow on the other side.

There are lots of ways to make fans, and some designs are really good at sucking. A vacuum cleaner uses the kind of fan that really sucks. It's still just a fan, though.