Table 13. RECOMMENDED MAXIMUM CAPACITIES OF CHIMNEYS FOR
H.W.H.
AND
H.W.S. INSTALLATIONS
kW
Metal chimney, internal diameter, millimetres
250/
300
350 400 450 500
550
600
650 700 810
Brick chimney
to
brick sizes, millimetres
Internal dimensions (approx.)
225
X
225
338
X
225
338
X
338
450
X
338
450
X
450
562
X
450
562
X
562
675
X
562
675
X
675
788
X
675
Ο ^ ΟΟ
Îst
Î3
SO ON
56
73
82
79
107
125
139
130
161
188
211
227
215
252
278
308
355
288
336
374
406
472
586
417
463
504
586
654
522
586
633
733
821
624
703
759
882
1150
844
910
1060
1180
1080
1230
1380
Fan Bases
The length
and
width
of
centrifugal
fan
bases vary considerabl ...
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