While looking for something else I across a series of CPSC tests of how much/fast CO was introduced into a test chamber by obstructed and disconnected vents on various types of GFAFs:

http://www.cpsc.gov/LIBRARY/FOIA/foi.../emission1.pdf http://www.cpsc.gov/LIBRARY/FOIA/foi.../emission2.pdf

One observation was that that the factory installed safety devices sometimes failed to shut down the furnace even under conditions (such as obstructed vents) which produced significantly elevated CO levels in the the test chamber.

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