Vertical Through-The-Roof Application - Vermont Castings 33CFDV(N/P)(V/I)SB Installation And Operating Instructions Manual

CFDV Series Gas Fireplace
Do not back fi ll around snorkel. A clearance
of at least 4" must be maintained between the
snorkel and the soil.
If the foundation is recessed, use recess brackets (not
supplied) for securing lower portion of the snorkel. Fas-
ten brackets to wall fi rst, then secure to snorkel with self
drilling #8 x 1 ⁄ sheet metal screws. It will be necessary to
2
extend vent pipes out as far as the protruding wall face.
Figure 42
Foundation
Recess
Watertight
Seal Around
Pipe
Figure 42 –
Snorkel installation, recessed foundation

VERTICAL THROUGH-THE-ROOF APPLICATION

For all vertical through-the-roof installations, the supplied
fl ue restrictors must be installed. Install the fl ue restrictor
according to the settings shown in the Vertical Through-the-
Roof Installation Flue Restrictor Chart in order to balance
the airfl ow in and out of the unit and to maintain proper
fl ame height.
Figure 43 –
Flue Restrictor Set at Medium Restriction
24
Snorkel
Wall Screws
Sheet Metal
Screws
BG401
FP3042
Vertical Through-the-Roof Installation
Flue Restrictor Setting Chart
Vertical Run
8-12 feet of pipe
(2.4 – 3.7 m)
12-40 feet of pipe
(3.7 – 12 m)
Figure 44 –
Flue Restrictor Set at Maximum Restriction
This gas fi replace has been approved for:
•
Vertical installations up to 40' (12 m) in height. Up to
a 10' (3 m) horizontal vent run can be installed within
the vent system using a maximum of two 90° elbows.
Figure 45
•
Up to two 45° elbows may be used within the horizontal
run. For each 45° elbow used on the horizontal plane,
the maximum horizontal length must be reduced by
18" (450 mm).
Example: Maximum horizontal length:
No elbows
1 x 45° elbow = 8.5' (2.6 m)
2 x 45° elbows = 7' (2.1 m)
•
A minimum of an 8' (2.5 m) vertical rise is required.
•
Two sets of 45° elbow offsets may be used within the
vertical sections. From 0 to a maximum of 8' (2.5 m) of
vent pipe can be used between elbows. Figure 46
•
7DVCS supports offsets. Figure 48. This application
will require that you fi rst determine the roof pitch and
use the appropriate starter kit. (Refer to Venting Com-
ponents List)
•
The maximum angular variation allowed in the system
is 270°. Figure 46
•
For the minimum height of the vent above the high-
est point of penetration through the roof refer to Figure
49.
VENTING INSTALLATION
Restrictor Setting
Medium restriction
Figure 43
Maximum restriction
Figure 44
FP3043
= 10' (3 m)
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