During Stardust's flyby, at least 10 gas vents were active.

When she adds that his touch made her sick, he returns to his apartment and turns on the gas vents.

'Did they report any sign of volcanic activity - gas vents, pumice, anything like that?'

The range of the mortars was controlled by opening gas vents from 400 to a maximum of 1,000 yards (366 and 910 m).

And in some places there are gas vents, chimneys of residual thermal activity.

These features are believed to be caused by impact craters or gas vents.

They are ancient gas vents, long since inactive.

But already the gas vents were behind them; there was no sure way out.

But in a moment, as Flach and the demons and dogs blinked back their sight, the hot gas vents were gone.

There are four gas vents scattered over the ceiling in this death room.