Chimney :
All chimneys work on principle of something called an updraft. Some are as small as a two-inch pipe and others are so large.
Updraft is an airflow that rises bottom to top. A pressure difference creates this updraft. This pressure difference is created by the inside of the chimney being sealed from the outside air.
All chimneys work on principle of something called an updraft. Some are as small as a two-inch pipe and others are so large.
Updraft is an airflow that rises bottom to top. A pressure difference creates this updraft. This pressure difference is created by the inside of the chimney being sealed from the outside air.
These are some conditions that chimney configuration has to met:
1. All chimneys must extend a certain distance above the roof line of a house or building. If this does occur a wind will cause the chimney to downdraft back into the house and create a reverse flow of the exhausting gas.
2.This can be seen when a fireplace blows smoke out of the front of the opening or when a wood stove puffs back smoke.
3.If the chimney is properly constructed and you still notice a small downdraft it may be clogged.
4.This is also a very good indication that it may be time to have the chimney cleaned or swept as the creosote is building up inside and impeding the airflow.
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