At the roofs with escarpment of up to 20%, the height of the chimney end twards the roof
top, has to be of minimum 1000 mm.
If there are elements with increased height towards the roof (attics, antifire walls), the
chimney must surpass their height with at least 1000 mm, exception is made fot the chimneys
situated at a smaller distance than 3000 mm of these elements, in which case the surpass can be
reduced to 500 mm.
At the roofs with escarpment >20%, the height of the chimney depends on the nature of the
casing and the position of the chimneys towards the foxhole top, as it follows:
-The chimneys placed up to 1500 mm of the top must surpass the top of the roof with 500
mm for inflammable casings and with 1000 mm for flammable casings.
-The chimneys placed at greater distances have to have the evacuating opening at the
height of at least 1000 mm towards the casing (measured on the slope normal line) and to
surpass the plan that passes the foxhole top and has an escarpment of 10
0
with the horizontal.
The reasons for malfunction of solid fuels boilers:
1) Small active height of the chimney.
2) Untight masonry of the chimney.
3) Too narow masonry of the chimney.
4) The existence of foreign parts or narowing of the chimney section.
5) Untight drop shutter.
6) Draught regulator wrongly adjusted.
7) The foxhole is in the chimney.
8) Untight joints to the foxhole .
9) Untight cleaning bay .
10) Most of the foxhole is without insulation, too little escarpment .
11) Untight joints(flanges), deteriorated insulations.
12) Reduced draught because of carbon clogged on the flame tubes.
13) Carbon settlement.
14) Untight cleaning lid .
15) Untight doors and body.
16) Draught regulator wrongly adjusted or broken.
17) The auxilliary air bay for burning.
18) The ash tray full.
19) The water cooled grid obturated with ash.
20) Reduced ventilation or closed in the heating space.
21) The cleaning door of the chimney is untight.
22) Very high temperature of the burning gases (very strong draught of the chimney or
boiler heated at the limits for covering the needs of heating).
23) Very low temperature of the burning gases (obvious function under the parameters of
the boiler, the boiler is too big for the heating needs).
24) Burning of wet fuel with low caloric power.
