Posted by FSWood on May 29, 2010 
Why is there a chain from regulator to firedoor?
Posted by Dennis A. Livesey on August 2, 2014 
This is only guess, but I believe the fireman grabs the chain to open the fire door without having to bend over. Apparently the throttle, (what we call the regulator in American parlance) offers a convenient attachment point.
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