I mean, they keep cold air away from your feet, for one thing.

"Do whatever you have to, but keep the air in here from getting out!"

A fan can also help keep air moving throughout an entire house.

"It'll relieve the pressure but keep the air from getting back in."

At least we'll have a place to keep the air in.

I'm keeping the air inside, and I'll pump the pressure way up.

Basically, it; simply a matter of keeping water and air away from the metal.

The bottle should be closed tightly to keep air out.

You want to nail this board all the way around the window in the door so it keeps air and water out.

The purpose of this gas is to keep normal air out, especially oxygen.