1. A collecting and transfer system that consists of a shroud connected to the automatic pressure limiting (APL) valve (or expiratory valve of the ventilator). A 30 mm connector attached to the transfer tubing leading to the receiving system.2. A receiving system (reservoir bag) can be used. Two springloaded valves guard against excessive positive (1000 Pa) or negative (-50 Pa) pressures in the scavenging system.The waste gases can be ducted out of the building via: An open window A pipe passing though an outside wall An extractor fan vented to the outside air (N.B. not into the building's air-conditioning system)
Inexpensive to set up Simple to operate
May be impractical in some buildings
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