Chimney cleanout door hazards (C) Carson Dunlop Associates Fire Clearance Requirements for Chimney Cleanout Doors

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Fire clearance to combustibles for chimney cleanout opening doors:

This article describes fire clearances for chimney cleanout doors. We also explain some of the other hazards associated with chimney cleanout doors. These articles on chimneys and chimney safety provide detailed suggestions describing how to perform a thorough visual inspection of chimneys for safety and other defects. Chimney inspection methods and chimney repair methods are also discussed.

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Chimney Cleanout Doors Left Open or Close to Combustibles

Chimney cleanout door hazards (C) Carson Dunlop Associates

A missing chimney cleanout door or a cleanout door left open  means that there is a fire safety hazard (sparks or ashes falling out onto the basement floor) and also that it is impossible to control the draft in the flue.

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we have found heating boilers with draft problems and "repair attempts" like removing the boiler's barometric damper, when all the while the root problem of bad chimney draft was that the cleanout door was open or missing.

A missing chimney cleanout door is most serious because it is unsafe.

But a missing cleanout door or simply a cleanout door that is left ajar makes it very difficult for the chimney to develop adequate draft.

In turn this means that a fireplace or an oil or gas fired heating appliance may be both unsafe (carbon monoxide gas, fire hazards) and also in poor operating state.

For example on oil fired heating systems and some fireplace chimneys we've found a draft inducer installed on a chimney to cope with inadequate draft when the root problem was a basement cleanout door that had fallen off.


On gas fired appliances, inadequate draft from a missing chimney door could lead to dangerous or even fatal carbon monoxide poisoning in a building.



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