NTI C85-340 - Page 16

Caprice │ Installation and Operation Instructions - Natural Draft C 85-340
16
Table 6-1 Minimum Chimney Sizes
Model
Minimum
Breaching
Diameter
Minimum I=B=R Chimney
Minimum
Chimney
Height
Boiler Flue
Collar Size
Rectangular
Round
C85
5 "
8 " x 8 "
1
6 "
15 '
6 "
C95
C105
C125
C150
C180
6 "
8 " x 8 "
1
7 "
15 '
6 "
C220
8 "
C230
7 "
8 " x 8 "
1
8 "
15 '
8 "
C250
C275
8 " x 12 "
2
C305
C340
8 "
8 " x 12 "
2
10 "
20 '
8 "
Notes:
1
6-3/4" x 6-3/4" inside liner.
2
6-1/2" x 10-1/2" inside liner.
3
Excessive breeching length or too many elbows and/or tee will cause restriction.
Figure 6-1 Breeching & Blocked Vent Switch
Blocked Vent Switch
Install the switch 6-8” above the boiler
breeching, refer to instructions included
with kit (mandatory in Canada).
Blocked Vent Switch
Draft Regulator
Secure breeching using
minimum of two screws,
equally spaced.