Monessen Hearth KHLDV400 - Manual (Page 17)

73D0024 17
KHLDV Series Gas Fireplace VentnG InStaLLatIOn
BeLOw GraDe InStaLLatIOnS
When it is not possible to meet the required vent terminal clearances of 12" above grade level, a snorkel kit is
recommended. It allows installation depth down to 7" (178mm) below grade level. The 7" (178mm) 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
recommend a window well with adequate and proper drainage to be installed around the termination
area.
If installing a snorkel, a minimum 24" vertical rise is necessary. The maximum horizontal run with the 24” verti-
cal 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 24".
1. Establish vent hole through the wall.
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 16
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 16
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 drilling #8 x 1/2 sheet metal screws. It will be
necessary to extend vent pipes out as far as the protruding wall face. Figure 17
FP2134
below grade install
FP2134
Figure 16 -
Below Grade Installation
Screws
Minimum
4" Clearance
Ground
Window Well
Gravel
Drain
Foundation Wall
Firestop
24"
Minimum
FP1966
snorkel
Figure 17 -
Snorkel Installation, Recessed Foundation
Foundation
Recess
Watertight Seal
Around Pipe Sheet Metal
Screws
Wall Screws
Snorkel
w
arn
In
G
• Do not back fill around snorkel.
• a clearance of at least 4" must be maintained
between the snorkel and the soil.