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Which chimney for your Stûv ? 
 
 



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A number of parameters determine the performance of your stove.
We offer a simplified method for an initial assessment.
Your fitter will take all parameters into consideration and make accurate calculations. Do consult him.


The chimney

.The flue should be as straight as possible.
.The ideal solution is a flue built inside the building and thermally insulated. Outside flues without insulation should not be used.


Draught

A fireplace will only work properly if the draught of the chimney attains at least a minimum value and does not exceed a maximum value. We will call these two values the ?Stûv coefficients' (T).
These coefficients are shown for the full range of Stûv stoves in the table opposite.The chimney draught is determined by a coefficient T, calculated according to the following formula :




Comments

. An excessive draught can always be reduced ; draught can be increased by installing a mechanical extractor.
. The chimney must be swept once a year.
. The draught may be disrupted by a powerful kitchen extractor hood, by some forced air central heating systems, or by the flue effect of a stairwell or a mezzanine. Consult your installer.
.Never connect a fireplace to a flue with a cross-section smaller than that of the outlet provided (except by agreement with Stûv).
S section (in cm2)
diameter in cm
in cm2
H height of chimney (in m) measured from the base of the flames
G defines the geometry of the chimney. It is given in the table below.
T defines the chimney draught
Stûv coefficients T

TypeT miniT2*minT maxi
15/601800-3240
15/702800-5040
16/581800-3900
16/682500-5200
16/783000-6400

21 simple face
21/4515002700
21/65C square180014503240
21/65H high200016003600
21/75260020804680
21/85360028806480
21/95460036808220
21/1052880-5580
21/1256800550012000
21/1354600-8000

21 double face
21/75 DF338027006084
21/85 DF468034508425
21/95 DF7880687212645
21/125 DF7900660013100

30 et 30in

2400
-
4280

30 up

2000
-
4000

60

3600
-
6480

This figures have been calculated for masonry conducts. For a pre-built steel conduct, you can increase the T figure with 20%.

*T2 min = T minimum with part-lift glass pane
Coefficients G

Straight flue with or without rotating capStraight flue with fixed cap
30° offset with or without rotating cap30° offset with fixed cap
45° offset with or without rotating cap45° offset with fixed cap

Insulated
interior
Insulated
exterior
non-insulated
interior
A0,190,250,30
B0,290,350,40
C0,310,370,42
D0,410,470,52
E0,370,430,48
F0,470,530,58
 
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