A downdraft in your chimney can make it difficult to start a fire. The
downdraft is caused by a difference in pressure. Outside, the air
pressure is relatively higher than inside your home because the air is
colder. Since air always flows from higher to lower pressure, the air
will come down the flue and into your home. To offset this, open a
window for a while. As colder air enters the home, it will reduce the
difference in pressure. The downdraft will subside and you will have
less hassle building a fire.
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