Chimney Height: The layout will have an effect on air circulation. Obstructions which cause air disturbances should be avoided. The smoke exhaust pipe, in particular, must 40cm higher than the top of the roof. For flat roofs, it must be higher than 120 cm (in this case, it must be properly secured). According to standards, the pipe must also be higher than any obstruction which is less than 8m away (e.g. trees)
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