<prompt> True about scavenging action in OTOutlet connection is 22 mm male fittingInterface limit pressure is 0 to 2 cm H2OThe charcoal as an adsorbent should not be usedScavenging is defined as the collection of excess gases from equipment used in administrating anesthesia or exhaled by the patient and removal of these gases to an appropriate places discharge outside the working environment  <response>: Scavenging system is to eliminate exhaled gases from OT to minimize theatre pollution. Maximum permissible concentration of N2O in theatre is 25 ppm and that of halogenated agents is less than 2 ppm. 