- It must be a ventilation shaft. - Wait!

- It must be a ventilation shaft.

So this is gonna be a little tricky, but your body's gotta be ventilated.

Uh, there's got to be a ventilation system.

Uh, there's got to be a ventilation system.

31.6.2.2 The watchglass is placed on a fire-resistant surface within a draught-free area that may be ventilated after each test.

There must be some sort of ventilation.

They must be in the central ventilation system

There must be some sort of ventilation system.

Of course. His internal heating and ventilation should be off.