Monessen Hearth HDV500NV/PV - Manual (Page 21)

56D3048 1
HDV Series Direct Vent Gas Fireplace VeNtING INStAllAtIoN
W
ARNING
you may use a reducer from 5" x 8"
to 4" x 6B\," for horizontal with vertical
rise application. oNly use framing
instructions below when using 4" x 6B\,"
venting.
If the reducer is installed at the rear of
the unit, you must immediately follow
with a 90° elbow for a vertical rise before
continuing with any horizontal run.
1. Locate and cut the vent opening in the wall. For com-
bustible walls first frame in opening.
Combustible Interior Walls: Cut a 11Z\x"H x 9Z\x" W
hole through the interior wall.
Combustible exterior Walls: Cut a 9Z\x"H x 9Z\x"W
square hole through the exterior wall frame. Figure 26
Noncombustible Walls:Hole opening should be 7Z\x"
(190 mm) in diameter.
. The center of the hole should line up with the center line
of the horizontal rigid vent pipe end. Allow 1 /4" minimum
rise per foot. Figure 26
Note: #1222DA reducer must be used when 4 x 6B\,"
venting is preferred. Reducer must be installed directly
onto unit at pipe adaptor before vertical rise.
VO584-100
Vent Opening
2/99 djt
Figure 26 -
Exterior Wall Framing Dimensions for 4 x 6B\," Venting
9Z\x"
(41 mm)
9Z\x"
(41 mm)
Combustible Wall
Framing
VO584-100
7Z\x"
(190 mm)
Noncombustible Wall
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 the 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 17, Figure
16
. 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
27
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 5" and 8" 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" clearance below
snorkel. Figure 27
FP1965
below grade install
24”
Minimum
Figure 27 -
Below Grade Installation
Screws
Minimum
4" Clearance
Ground
Window
Well
Gravel
Drain
Foundation Wall
Firestop
FP1965