In article , tigerpaw40
@aol.com says...
Have a wood burning fireplace in family room of a house recently purchased.
After burning Duraflame or Northland logs the next morning the house smells
like a campfire doused with water. THe odor last 2-3 days. I have tried leaving
the flue open till the next morning and closing it an hour or so after logs are
burned up. Any ideas what could be causing this?

It sounds like low pressure in the house (possibly caused by vent hood,
bathroom fans, furnace?) is drawing cold air down your chimney and
bringing chimney odors in with it. It could even be as simple as the
chimney being on an outside wall, cooling off overnight, and the cold
air in the chimney falling into the house.

Most flues are not air tight enough to prevent either of these.

Rick