Kalfire W Series, Installation And User Manual, Page: 19 / 68

3.6 Chimney/flue connection
The Kalfire W is connected to an existing flue. The operational
height of the flue must be minimum 4.5 meter (draught 12 Pa),
calculated from the point at which the flue duct is joined to the
appliance.
Take local legislation and environmental factors into
account.
Table 3: Chimney/flue diameter and firebox per model
If you want to use a flue diameter that differs from those shown
in table 3, use the formula below to calculate a possibly smaller
diameter.
Kalfire type
Firebox (mm)
Width/ height
Firebox (cm²)
Minimum fresh
air supply (mm)
Flue (mm)
W45/48F 415/ 454 1884 1× Ø150 mm Ø150
W60/51F 545/ 470 2560 1× Ø150 mm Ø180
W65/38C
610/ 374
333/ 374
3527 2× Ø150 mm Ø180/Ø200
W66/48S
355/ 475 (2×)
620/ 475
4631 2× Ø150 mm Ø200
W70/33F 305/ 665 2028 2× Ø150 mm Ø180
W71/62F 655/ 580 3800 2× Ø150 mm Ø250
W80/52T 747/ 485(2×) 3625 (2×) 2× Ø150 mm Ø200
W85/40F 795/ 360 2860 2× Ø150 mm Ø200
W90/47C
870/ 460
390/ 460
5796 2× Ø150 mm Ø250
W90/47S
870/ 460
390/ 460 (2×)
7590 2× Ø150 mm Ø250/ Ø300
W100/61F 570/ 926 5278 2× Ø150 mm Ø250
W105/47F 995/ 440 4380 2× Ø150 mm Ø250
W105/47T 995/ 440(2×) 4380(2×) 2× Ø150 mm Ø250
W120/38F 1145/ 340 3895 2× Ø150 Ø250
Fsch
Fso
Hsch
e Flue section in cm².
Surface firebox in cm².
Height of flue in metre measured from the upper side of the Kalfire.
Influence factor between 0.2 and 0.6 determined by the flue quality:
0.2 with a perfect flue, straight above the Kalfire; 0.6 with connection
less than 45°.
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