A rotating aspirator cowl will help the draw of the chimney when it is windy
(speak to a Flue Specialist). A rotating cowl will help move the cold air up
and out of the chimney and helps keep the air moving.
If all the above does not work, then the issue is usually a draught problem.
The stove relies on a good suction (draught or draft) to draw the smoke
up and out of the stove and property. There are some things that can
cause a poor draught in stoves e.g. a cold chimney, down draughts or an
obstruction in the chimney. In this instance you would need to seek advice
from a chimney sweep or flue specialist.