Stoelting has configured an open circuit system




(without absorption chamber or breathing bag) for scientists




who work only with rodents and small animals.




The tidal volumes of small (<7kg) animals do not allow for an




absorption chamber and recycling. A slow flow of gas from the




vaporizer output is released at the animal’s nose.




Anesthetic gas from a vaporizer is connected via tubing to the




scavenger unit and passed to a mask covering the animals nostrils.




Gases are removed from the mask and the immediate vicinity by




vacuum in an outer mask.