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.

Another cause is strong winds. The remedy is a turn-cap on top of the
chimney.

Another cause is the roughness of the inside of a chimney, or
projections which impede the passage of the smoke. Every chimney should
be built of equal dimensions from bottom to top, with no projections
into it, with as few bends as possible, and with the surface of the
inside as smooth as possible.

Another cause of poor draughts is openings into the chimney of chambers
for stove-pipes. The remedy is to close them, or insert stove-pipes
that are in use.

Another cause is the falling out of brick in some part of the chimney
so that outer air is admitted. The remedy is to close the opening.

The draught of a stove may be affected by most of these causes. It
also demands that the fireplace have a tight fire-board, or that the
throat he carefully filled. For neglecting this, many a good stove has
been thrown aside and a poor one taken in its place.