Miniature smoke chart
A chart, printed in shades of grey matt lacquer, which when held at about 5 ft from the observer gives readings of the density values of smoke from chimneys. These are comparable with those obtained from the BS Ringelmann Chart (BS 2742C). The method of use is explained in BS 2742.
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Domestic solid fuel burning appliances - Method for determination of flue gas emission
Domestic solid fuel burning appliance - Pellet heaters - Determination of flue gas emission
Use of the Ringelmann and miniature smoke charts