'Gas off' or 'vaporiser off'.
Rassam
S
S
Baraz
R
R
Stacey
M
M
D000395:Air Pollutants, Occupational; D000764:Anesthesia, Closed-Circuit / Q000379:methods*; D006801:Humans; D007442:Intubation, Intratracheal; D009330:Nebulizers and Vaporizers
D000395:Air Pollutants, Occupational