For the CARBOROBOT boilers the necessary chimney
draught by the stopped ventilator fan is 10-20Pa. This is
about 6-7m(18-20 foot) aktнve chimney tube lenght
from inlet to the tube end.
Here is some drawings to help to define the chimney
placement
hight
Sizing
1
Sizing
2
Chimneys can be broken down into two main categories;
metal and masonry. Metal chimneys, also called
prefab.
Metal chimney
6 Inch Inside Diameter (28.3 Square Inches)
7 Inch Inside Diameter (38.5 Square Inches)
8 Inch Inside Diameter (50.3 Square Inches)
10 Inch Inside Dia. (78.6 Square Inches)
One thing that we notice from this table is that a 6"
flue is almost 1/2 the size of an 8" flue. The natural
tendency might be to think that a 6" flue is "only"
two inches smaller that an 8" one, but in truth you
can see the difference is much larger.
Masonry Flues
7 1/2 X 7 1/2 (31 Square Inches)
8 1/2 x 8 1/2 (41 Square Inches)
8 1/2 X 13 (70 Square Inches)
13 X 13 (99 Square Inches)
13 X 18 (156 Square Inches)
