4 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 30-up - 2201 - EN Measuring the size of the chimney flue The Stûv 30-up will only operate adequately if the draught value of the chimney flue T is between 2000 and 4000. 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%. Table of G coefficients Concept & Forme reserve the right to alter Stûv stoves without prior notice. Information on www.stuv.eu 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 Barbecue kit Flue union Bottom cover Open fire valve Outside air valve The accessories
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