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[kcrovatt]

http://clearchimney.com/why-is-fireplace-smoke-in-my-house/

Why is fireplace smoke in my house?

[kcrovatt]

Why is Fireplace Smoke in My House?

The smoke that escapes from your fireplace into your house is a result of poor drafting (air moving in an upward or downward direction), or something blocking the way of the draft.  We often ask why is fireplace smoke in my house?

A poorly, drafting chimney allows smoke from the fireplace to enter the room rather than exhausting it to the outside.  A blockage in the chimney prevents drafting in the same way that a closed nozzle at the end of a hose prevents water flow.  The air being pulled (draft) up your chimney works under the same scientific principles as water flowing in a hose, and it corresponds to the amount of pressure in a water hose.  The only difference is that the air pressure is negative, and the water pressure is positive.  Similar to the way a kinked or plugged hose stops water flow, a poorly drafting chimney is the result of an airflow restriction.

This can be caused by a of multitude of factors such as:

http://clearchimney.com/why-is-fireplace-smoke-in-my-house/