What flow does an AGSS extract per operating room?

HTM 02-01 states AGSS performance as extract flow at a specified resistance, and notes that the flow rates of the AGSS directly affect the flow induced on the patient's breathing system, so they have to be set up and kept correct.

Design flows (HTM 02-01, Table 12)

More than one AGS terminal unit may be fitted in a room, but only one per room is in use at a time. The anaesthetic room and operating room units are likely to run together, so the plant is sized for two terminal units per operating suite, and one AGSS serves at most six terminal units, or two theatres (12.25, 12.29 and 12.30).

Performance criteria (HTM 02-01, Table 22)

HTM notes that these values differ from the BS EN ISO 7396-2 Type 1H and 1L values, to stay compatible with the receiving systems and anaesthetic equipment in use, and asks for pipelines to be designed to the high-flow criteria whatever equipment will be connected (12.19). Single-chair dental scavenging (DAGS) is different: its fan unit should produce no less than 80 L/min (12.43).

Plant capacity and terminal unit flow

The ULTRASEG datasheet gives plant capacity, not the flow per terminal unit: its table lists pump capacities from the H50 (50 m³/h at 50 Hz) to the E300 (315 m³/h at 50 Hz), at a suction level of −0.2 bar, and each ULTRASEG terminal unit has an adjustable orifice to set its flow. The plant model is selected from the number of terminal units it serves and their design flow.