> Virtually no house is so air tight that it will not draft
> adequately for a
> clean burning appliance. The ability of the oxygen level in
> the house to go
> down far enough to cause poor combustion is almost an
> impossibility.
So much so that all gas heaters made since 1982 are required to incorporate
an oxygen depletion sensor in the safety valve.
http://www.cpsc.gov/CPSCPUB/PUBS/452.html
Randall
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