There are air vents running just above the ground.

She lowered her head and peered out the air vents.

I shall gas them both through the air vents of their rooms.

Something large and black stepped in front of the air vents.

It made the front of the air vents for cooling trunk.

Looks like it's in the air vents as well, but it doesn't come down into the rooms.

We have to find out who's throwing garbage into the air vents.

Big air vents along the walls, down at the bottom of the building, and some chemical smell.

"They must have come in through the air vents," he continued.

I made sure the air vents were wide open.