TERMOROSA TR-02 - Narvells

5. FLUE
Essential requirements or correct operation of the appliance:
• the internal section must be circular;
• it must be insulated thermally and impermeable
and built with materials resistant to heat, products
of combustion and any condenses;
• be free of obstructions and have vertical
passageway with deviations not greater than 45°;
• if already used must be clean;
• comply with technical data of the instruction
manuals;
If the flues were square or rectangular the internal
corners must be rounded with a radius not less than 20
mm. For the rectangular section the maximum ratio
between the sides must be = 1.5.
A section that is too small causes a fall in the draught. A
minimum height of 4m is recommended.
The following are forbidden and compromise the good
operation of the appliance: fibrocement, galvanised steel,
internal rough and porous surfaces. Picture 4 shows
some sample solutions.
The minimum section must be of 4 dm 2 (for example
20x20cm) for appliances whose conduit diameter is
lower than 200mm, or 6.25dm 2 (for example 25x25cm)
for appliances with a diameter greater than 200mm.
Wood burning stove/cooker – TERMOROSA TR02
The draught created by your flue must be sufficient but not excessive.
A section of the flue that is too large can present a volume too large to heat and therefore cause difficulty in
operation of the appliance; to avoid this maintain the same section for its entire height. A section that is too
small causes a fall in the draught.
The flue must be suitably distanced from inflammable or combustible materials by an appropriate
insulation or air gap.
It is forbidden to obstruct inside the tubing of systems or air ducts. It is also forbidden to install adjustable or
fixed openings, on the same, to connect other devices.
5.1. POSITION OF CHIMNEY CAP
The draught of the flue also depends on the suitability of the chimney cap.
It is therefore essential that, if built by hand, the free air outlet is more than twice the internal section of the
flue.
Having to always exceed the roof ridge, the chimney cap must ensure the outflow even in presence of wind
(Picture 5).
The chimney cap must respect the following requirements:
• have an internal section equivalent to that of the chimney.
• have a section of free exit double the internal one of the flue.
• be built in a way so as to avoid penetration of rain, snow and any other foreign body into the flue.
• be easy to inspect, for any maintenance and cleaning.
(1) (2)
((1) Stainless steel AISI 316 with double chamber
insulated with material resistant to 400°C.
Efficiency 100% excellent.
(2) Refractory lined flue with double chamber and
lightweight concrete cladding. Efficiency
100% excellent.
(3) Traditional flue in clay square section with
gaps. Efficiency 80% excellent.
(4) Avoid rectangular flue with aspect ratio
which differs from the drawing.
Efficiency 40% average.
Picture 4
26 Installation, user and maintenance instructions – EN – Rev.07
(3)
(4)
A+1/2A
Max.
A+1/2A
A