Turn off local fans or ventilation units in the area.

A massive ventilation unit leaned uneasily atop the pile.

These jet aircraft's cooling and ventilation units also serve the purpose of pressurizing the aircraft cabin.

The ventilation units shut down and the smoke began to accumulate again.

After two and a half hours he ordered the ventilation units turned back on, over Wren's protests.

The 560 Series is a portable ventilation unit.

He took his ventilation unit from where it had been charging and hooked himself up.

At the back on the web belt hung the ventilation unit.

"I must see to the ventilation units; there's work to be done."

He heard the humming of refrigerators, the droning purr of the ventilation unit in the ceiling.