Monessen Hearth HBDV400N/PSC7 - Manual (Page 21)

HBDV7 Series Direct Vent Gas Fireplace
54D8000 1
VeNtING INStAllAtIoN
FP1966
snorkel
Foundation
Recess
Snorkel
Wall Screws
Sheet Metal
Screws Watertight Seal
Around Pipe
FP1966
Figure 34 -
Snorkel Installation, Recessed Foundation
BeloW GRADe INStAllAtIoNS
When it is not possible to meet the required vent terminal
clearances of 1" above grade level, a snorkel kit is recom-
mended. 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 that sidewall venting clearances are observed.
If venting system is installed below ground, we recom-
mend a window well with adequate and proper drainage
to be installed around the termination area.
If installing a snorkel, a minimum 4" vertical rise is neces-
sary. The maximum horizontal run with the 4” vertical pipe
is 36". 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".
1. Establish vent hole through the wall. Page 19, Figure
28
. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
supplied). Refill hole with 1" of coarse gravel leaving
a clearance of approximately 4" below snorkel. Figure
33
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.
BG402a
Top Vent
Below grade installation
1/26/00 djt
Firestop
Screws
Minimum 4”
Clearance
Ground
Window
Well
Gravel
Drain
Foundation Wall
BG40a
4” (610 mm)
Minimum
Figure 33 -
Below Grade Installation
Snorkel
7”
Pipe
6. Slide the snorkel into the vent pipes and secure to the
wall.
7. Level the soil so as to maintain a 4" clearance below
snorkel. Figure 33
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 34
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 35
• 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 35