7 30° 45° 45° 30° a 30° 45° 45° 30° b 30° 45° 45° 30° c 30° 45° 45° 30° d 30° 45° 45° 30° e 30° 45° 45° 30° f stûv 21 - 012022 - EN Table of G coefficients Stûv reserve the right to alter stûv stoves without prior notice. Information on www.stuv.com is regularly updated. straight flue with or without rotating cap straight flue with fixed cap 30° offset with or without rotating cap 30° offset with fixed cap 45° offset with or without rotating cap 45° offset with fixed cap insulated interior flue 0.19 0.29 0.31 0.41 0.37 0.47 insulated exterior flue 0.25 0.35 0.37 0.47 0.43 0.53 non-insulated interior flue 0.30 0.40 0.42 0.52 0.48 0.58 Measuring the size of the chimney flue The stûv 21 will operate adequately if the T value defining the draught value of the chimney flue reads between T maxi and T mini. When the fireplace has been installed so as to operate only with the glass door partially open, this value must read between T maxi and T2 mini. Measuring the draught : T is the chimney draught S is the flue cross-section (in cm2) H is the height of chimney (in m), measured from the base of the flames G characterises the geometry of the chimney ; it is given in the table below. This figures have been calculated for masonry conducts. For a pre-built steel conduct, you can increase the T figure with 20%. stûv coefficients (T) Model T mini T2 mini T maxi 21/65H high 2000 1600 3600 21/75 2600 2080 4680 21/85 3600 2880 6480 21/95 4600 3680 8220 21/105 2880 - 5580 21/125 6800 5500 12000 21/135 4600 - 8000 21/75 DF 3380 2700 6084 21/85 DF 4680 3450 8425 21/95 DF 7880 6872 12645 21/125 DF 7900 6600 13100
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