Below Grade Installation - Monessen Hearth 624DVNVC Installation And Operating Instructions Manual

Designer Series Gas Fireplaces
BELow GRadE INSTaLLaTIoNS
When it is not possible to meet the required vent terminal
clearances of 12" 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 drain-
age to be installed around the termination area.
If installing a snorkel, a minimum 24" vertical rise is nec-
essary. The maximum horizontal run with the 24" vertical
pipe is 36". This measurement is taken from the collar of
the fireplace (or transition elbow) to the face of the exterior
wall. Refer to the Sidewall Venting Graph for extended
horizontal run if the vertical exceeds 24".
1. Establish vent hole through the wall. Refer to Page 18,
Figure 18
2. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
supplied). Refill hole with 12" of coarse gravel leaving
a clearance of approximately 4" below snorkel. Figure
29
Firestop
24"
Minimum
Figure 29 -
FP1965

Below Grade Installation

below grade install
3. Install vent system.
4. Ensure a watertight seal is made around the vent pipe
coming through the wall.
5. Slide the snorkel into the vent pipes and secure to the
wall.
20
Screws
Minimum
4" Clearance
Ground
Gravel
Drain
Foundation Wall
FP1965
6. Level the soil so as to maintain a 4" clearance below
snorkel. Figure 29
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 1/2" sheet metal screws. It will be necessary to
extend vent pipes out as far as the protruding wall face.
Figure 30
Foundation
Recess
Watertight Seal
Around Pipe
Figure 30 -
Snorkel Installation, Recessed Foundation FP1966
snorkel
• do not back fill around snorkel.
• a clearance of at least 4" must be
maintained between the snorkel and the
soil.
Window
Well
vENTING INSTaLLaTIoN
Snorkel
Wall Screws
Sheet Metal
Screws
FP1966
42D0200