Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Accumulation of smoke and dust over the sigrees
Lack of oxygen in the surroundings of sigrees
Tendency of carbon dioxide to form a layer along with dust smoke
Interrupted release of moisture from the material

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Chemistry
Man dies in the atmosphere of CO, because it

Reduces the organic matter of tissues
Combines with O2 present in the body
Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2
Dries up the blood

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