Sometimes it will work well and sometimes
it will not. The only safe rule is to have a separate flue to each
fire.
Another cause of poor draughts is too tight a room, so that the cold
air from without can not enter to press the warm air up the chimney.
The remedy is to admit a small current of air from without.
Another cause is two chimneys in one room, or in rooms opening together,
in which the draught in one is much stronger than in the other. In
this case, the stronger draught will draw away from the weaker. The
remedy is, for each room to have a proper supply of outside air; or,
in a single room, to stop one of the chimneys.
Another cause is the too close vicinity of a hill or buildings higher
than the top of the chimney, and the remedy for this is to raise the
chimney.
Another cause is the descent, into unused fireplaces, of smoke from
other chimneys near. The remedy is to close the throat of the unused
chimney.
Another cause is a door opening toward the fireplace, on the same side
of the room, so that its draught passes along the wall and makes a
current that draws out the smoke. The remedy is to change the hanging
of the door so as to open another way.
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