Monessen Hearth CDVR33N/PV7;N/PE7;N/PSC7 - Manual (Page 24)

CDVSC7 & CDV7 Series Gas Fireplace
4 69D3011
VenTInG InSTallaTIon
Below GRaDe InSTallaTIon
When it is not possible to meet the required vent terminal
clearances of 1” (305 mm) above grade level, a snor-
kel kit is recommended. It allows installation depth down
to 7” (178 mm) below grade level. The 7” (178 mm) is
measured from the center of the horizontal vent pipe as it
penetrates through the wall.
ensure the sidewall venting clearances are observed.
If venting system is installed below ground, we rec-
ommend a window well with adequate and proper
drainage to be installed around the termination area.
If installing a snorkel, a minimum 4” (610 mm) vertical
rise is necessary. The maximum horizontal run with the
4” vertical pipe is 36” (914 mm). This measurement is
taken from the collar of the fireplace (or transition elbow)
to the face of the exterior wall. See the Sidewall Venting
Graph for extended horizontal run if the vertical exceeds
4” (610 mm).
1. Establish vent hole through the wall. Page 22, Figure
26
. Remove soil to a depth of approximately 16” (406 mm)
below base of snorkel. Install drain pipe. Install window
well (not supplied). Refill hole with 1” (305 mm) of
coarse gravel leaving a clearance of approximately 4”
(10 mm) below snorkel. Figure 31
3. Install vent system.
4. Ensure a watertight seal is made around the vent pipe
coming through the wall.
5. Apply high temperature sealant caulking (supplied)
around the 4” and 7” snorkel collars.
6. Slide the snorkel into the vent pipes and secure to the
wall.
7. Level the soil so as to maintain a 4” (10 mm) clearance
below snorkel. Figure 31
BG402a
Top Vent
Below grade installation
1/26/00 djt
Firestop
7” Pipe
7TDVSNORK
(Snorkel)
4” (10 mm)
Clearance
Min.
Window
Well
Gravel
Drain
BG40a Figure 31 -
Below Grade Installation
*A minimum of 4” (610 mm) verti-
cal pipe must be installed when
using the 7TDVSNORK Kit.
4” (610 mm)
Minimum*
Screws
Foundation Wall
Do not back fill 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. Fasten
brackets to wall first, then secure to snorkel with self drill-
ing #8 x 1/ sheet metal screws. It will be necessary to
extend vent pipes out as far as the protruding wall face.
Figure 32
BG401
Snorkel
2/10/99 djt
Snorkel
Wall Screws
Foundation
Recess
Watertight
Seal Around
PIpe Sheet Metal Screws
BG401
Figure 32 -
Snorkel installation, recessed foundation
VeRTICal ThRouGh-The-RooF applICa-
TIon
his gas fireplace has been approved for:
• Vertical installations up to 40’ (1 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 33
• 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 = 10’ (3 m)
1 x 45° elbow = 8.5’ (.6 m)
x 45° elbows = 7’ (.1 m)
• A minimum of an 8’ (.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’ (.5 m) of
vent pipe can be used between elbows. Figure 33
• 7DVCS supports offsets. Figure 37. This application
will require that you first 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 70°. Figure 34