At 09:04 PM 2/4/2009, chris and/or ruth wrote...
>It's not the low Oxygen that will kill ya, it's the Carbon Monoxide.
>That Mr Buddy is eating Oxygen and crapping out heat, Carbon Dioxide,
>water vapor.... and CO (Carbon Monoxide).

Yes, and the rest of your post indicates a lack of knowledge about what
causes a heater to put out high levels of CO.

Fact is, the major reason for CO is incomplete combustion, caused by a
lack of oxygen. As oxygen levels decrease, combustion produces higher
levels of CO. Hence, the oxygen sensor/shutoff _does_ have a direct
relation to CO.

ANSI Z21.63 (2000) specifies that when an infrared radiant heater is
operated in a 100 ft^3 room (a Vanagon is closer to 200 cubic feet,
even more on a Westy with the top up) at air exchange rates of 0.5,
1.0, and 1.5 air changes per hour, the CO concentration in the room
cannot exceed 100 ppm.  In addition, Z21.63 specifies that the O2
concentration in the room cannot be depleted below 16 percent at any
time.