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Induction chambers have a bad reputation!

When an induction chamber is connected to your in-house scavenging system anesthetic gas enters the chamber and empties from the chamber at the same time.  This is highly inefficient.  It can take up to 5 minutes to fill a chamber with the right concentration of anesthetic gas to anesthetize an animal.  
When an induction chamber is connected to the Induction Chamber Evacuation System, the chamber reaches the right concentration much faster because the scavenging system is passive (filtering WAG into an activated charcoal canister during filling) and because incoming gas hits a baffle that causes the gas to circulate inside the chamber while filling.
Then, before opening, scavenging becomes active and waste anesthetic gas is quickly removed before opening to remove the animal.

Delayed induction time

Using traditional methods of filling an induction chamber while connected to an in-house (active) scavenging system; it can take as long as 8 minutes for the top portion of an induction chamber to reach 3% isoflurane, resulting in a delayed and stressful induction.