Naturally a chimney encourages air to travel up through it whether a fire has been lit or not; the taller and straighter the chimney the better the draught. In some areas because of the way that a house has been built or the natural surroundings the wind is forced down a chimney with greater force than the upward pressure in the flue. This can cause a fire to smoke on occasions. Fitting an anti down draught cowl or pot can help. The Marcone pot can be effective as well as the Eurocowl.
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