How should an open scavenging interface be set?
Keep the indicator float between the lines, and remember that the audible suction sound is an indication that it is functioning properly. This is unlike the closed interface, where if you can hear a hiss, waste gas is escaping into the room. The open interface is safer for the patient (open to atmosphere, so there is no chance of excess positive or negative pressure being transmitted to the breathing circuit), but less safe for the caregiver if you don’t know how to use it (potential waste gas exposure).
