Page 38 - Domestic Smoke Nuisance and Emissions Final_Neat

Falling air?

• Cold Air Can Cause Low pressure zones in some heated spaces

• Causes depressurisation and back drafting of appliances

• Flues And Chimneys Should Ideally be Integral to The Building Envelop or

Insulated

NB

It is often said that cold air leaks from a wood burning appliance simply because cold air is heavy and falls down the

chimney. But this is a misinterpretation of the physics at work in chimneys. While is true that cold air is heavier than warm

air, it is does not fall down the chimney. Instead, it is drawn down the chimney towards the zone of lower pressure lower in

the house. Air flows down the chimney because air always flows to zones of lower pressure, not because cold air is heavy.
Welcome to the Next Level CST. CITB-SDC 2020