Chimney and acessories

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Biomass boilers
         For warm water

  • BIO
    Automated, pellet, wood chips,

  • Farmer
    Automated, pellet,wood chips,
    wood logs, multifuel

  • Automat
    Self-loading, automated,
    pellet, wood chips, multifuel

Steam boilers    

  • Low pressure steam (0,5bar) automated boilers for biomass, pellet, wood chips, multifuel        

Coal boilers

  • Automated brown coal boilers
    For warm water or low pressure steam

Fuel feeder systems

Chimney sizes for CARBOROBOT

For the CARBOROBOT boilers the necessary chimney draught is 10-15Pa after 10 minutes when the ventilator fan is stopped. This is about 8-9m(22-24 foot) aktíve chimney tube lenght from inlet to the tube end.

Here is some drawings to help to define the chimney
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)

Masonry and prefab steel tube by the CARBOROBOT power


or insulated stainless tube diameter 130mm (6inch)
7-8m chimney length


or insulated stainless tube diameter 180mm (6x7inch)
7-8m chimney length


or insulated stainless tube diameter 180mm (8inch)
8-10m chimney length

or insulated stainless tube diameter 200mm (8x10inch)
8-10m chimney length


or insulated stainless tube diameter
8-10m chimney length

CARBOROBOT boiler's burning characteristic

Prefab stainless steel chimney

This chimney tubes offered for the CARBOROBOT boilers inner tube material is stainless steel. Cover tube is aluminium. Inner tube diameter between 120- 350mm insulation 30 or 50mm. Possible lenght up to 15m, insulation 500°C or 1200°C

Key elements for mounting of the flue
1. Fan. This must be installed in line with the flue but also made sure it is kept dry and remains within the boiler house. If it gets wet, the cold fan house corrodes quickly.
2. Transition flange(diffuser). This does not come with the boiler and has to be purchased separately. This allows connection with boiler to the flue.
3. Fan brackets. By this it is easier to place the fan in the proper direction. These can be purchased separately if required to hold the fan. They have rubber mounted 'feet' to reduce any noise produced by the fan.
4. The flue end cap.
5. Cleaning pipe / water trap. To allow collection of any moisture collected within the flue and for cleaning of fly ash and other ash build up.
6. Connection pipe. The fan joins at this point either at 45 or 90 degrees.
7. Flue pipe. It is assembled by sliding 3-4m parts into each other. An insulated flue needs to be used. Its insulation is from heat-proof ceramic wool. The inside tube is acid-proof, the outside cover is aluminium.
8. Flue fixing clamps
9. Flue end cap should be fitted to stop the effect of high winds and heavy rain and to block the return-flow. The flue should be above the roof ridge height to allow natural draw so exhaust gases can get away easier.

Chimney parts


Felxibile stainless steel double wall tube

Fan with diffusor shape

Diffusors and rigid tube for the fan

Console types

Noise reducing mounting assembly for any type (mostly recommended)

Wall console with rubber noise amortisators

Automatic flue gas damper

1 Boiler

2 Flue outlet

3 Damper

4 Fan.


Automatic flue gas damper It is sometimes necessary to adjust the draft of the flue. Too strong a draft for some fuels (e.g. wood pellets) can override the control system of the boiler, so that when the fire should go down, it continues to burn at a lower rate instead. Furthermore, the damper prevents the boiler from cooling down too quickly by closing the flap to reduce the amount of warm air escaping through the chimney. This improves the efficiency of the boiler.
The opening and closing angles can be adjusted with the 1st and 2nd stop screws , the closing angle shows the 3. nomination.
Attention! A closed damper significantly reduces drafts, so it is possible that stopping the boiler smoke coming out of vents. If this happens, then the dampers closed 2. fixing bolt set the less closed position, to be remainder draft larger, and it can suck the smoke from the boiler.
The colder winter weather in the chimney terminal draft is larger, but in warm weather reduced and may require re-adjustment of the damper. This option is the operator's responsibility.
The buffers marked 6. always set of specified end position so as not to interfere with the setting screws 1. and 2. With the 5. Reversing buttons may be to adjust when the fan is turned on, open, or close the damper. (of course, to open in this case)
The mechanical uncoupling hand button 4. can be disconnect the gears, so possible freely adjust the damper. If you let go the button, the engine will automatically to the end position turn the flap again.

The damper must be installed on the boiler flue outlet. In all cases, the engine bottom, or side to place. Never mount the engine upper position, above the flue tube, because of the rising hot air melts the engine.
The damper has two positions: closed when the fan is off - and open when the fan is on (i.e. the boiler is firing)
In operation the damper is automatically controlled together with the fan. It takes 30 seconds for the flap to change position.
The drive motor running with 230V.

Damper connecting:
- White wire: 230V at the same time switch on / off Line together with the fan
- Brown wire: Continuous 230V Line
- Blue wire: Neutral, continuous

110-130-150-180-200-250 mm diameters
Heat load. max.350 °C.

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