chaniarts wrote:

-snip-
i have 2 propane (vented) fireplaces. every year before i turn on the
pilot i have to clean the inside of the glass to get rid of the soot, so
there must be something coming out of it that would go into your house
if unvented.

If you have soot, then your flame/air supply needs adjusting. Or
maybe you're burning up your logs-- are they charring?

Jim