8000026412_01 Air/flue pipe installation manual 47
5.17.7 Calculating the offset dimensions for the
external wall installation
5.17.7.1 Calculating the offset dimensions of 30°
elbows (external wall)
A Offset
B Length of the air pipe
C Height
Formula for an offset with extension that can be shortened
B = (A × 2) − 106 mm
C = (A × 1.7319) + 136 mm
Formula for an offset with extension that can be shortened
+ 0.5 m extension
B = (A × 2) − 106 mm
C = (A × 1.7319) + 136 mm
Length of the air pipe for the extension that can be
shortened = B − 460 mm
Formula for an offset with extension that can be shortened
1 m extension
B = (A × 2) − 106 mm
C = (A × 1.7319) + 136 mm
Length of the air pipe for the extension that can be
shortened = B − 960 mm
Restrictions
Offset (A)
No extension that can be shortened 53 mm
Extension that can be shortened 110 to 300 mm
0.5 m extension only 298 mm
0.5 m extension + extension that can be
shortened
340 to 530 mm
1 m extension only 548 mm
1 m extension + extension that can be
shortened
590 to 780 mm
not possible 54 to 109 mm
299 to 339 mm
549 to 589 mm
Example of an offset with extension that can be shortened
Required offset (A): 200 mm
B = (200 mm × 2) − 106 mm = 294 mm
C = (200 mm × 1.7319) + 136 mm = 482 mm
Example of an offset with extension that can be shortened +
0.5 m extension
Required offset (A): 450 mm
B = (450 mm × 2) − 106 mm = 794 mm
C = (450 mm × 1.7319) + 136 mm = 915 mm
Length of the air pipe for the extension that can be
shortened = 794 mm − 460 mm = 334 mm
Example of an offset with extension that can be shortened
1 m extension
Required offset (A): 750 mm
B = (750 mm × 2) − 106 mm = 1394 mm
C = (750 mm × 1.7319) + 136 mm = 1435 mm
Length of the air pipe for the extension that can be
shortened = 1394 mm − 960 mm = 434 mm
5.17.7.2 Calculating the offset dimensions of 45°
elbows (external wall)
A Offset
B Length of the air pipe
C Height
Formula for an offset with extension that can be shortened
B = (A × 1.4142) − 120 mm
C = A + 150 mm
Formula for an offset with extension that can be shortened
+ 0.5 m extension
B = (A × 1.4142) − 120 mm
C = A + 150 mm
Length of the air pipe for the extension that can be
shortened = B − 460 mm
Formula for an offset with extension that can be shortened
1 m extension
B = (A × 1.4142) − 120 mm
C = A + 150 mm
Length of the air pipe for the extension that can be
shortened = B − 960 mm
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