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Elbow 1 =
Example:
Elbow 2 =
Elbow 3 =
Elbow 4 =
Total Angular Variation =
1
2
3
4
12"
Minimum
Figure 5.8 - Maximum Elbow Usage
E. 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.
90°
45°
45°
90°
270°
FP1383
FP1383
Max bends
Outdoor Lifestyles • ODMEZG-36 Installation Manual • 4601-901 Rev. B • 10/17
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 12" vertical rise is neces-
sary. The maximum horizontal run with the 12" vertical pipe
is 36". This measurement is taken from the collar of the
fireplace (or transition elbow) to the face of the exterior wall.
1
See the Sidewall Venting Graph for extended horizontal
run if the vertical exceeds 12".
2
1. Establish vent hole through the wall.
3
2. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
4
supplied). Refill hole with 12" of coarse gravel leaving
a clearance of approximately 4" below snorkel. Figure
5.9.
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.
Firestop
12"
(305 mm)
Minimum
FP2134
Figure 5.9 - Below Grade Installation
FP2134
6. Slide the snorkel into the vent pipes and secure to the
wall.
below grade install
7. Level the soil so as to maintain a 4" clearance below
snorkel. Figure 5.9.
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
⁄
" sheet metal screws. It will be necessary to extend
1
2
vent pipes out as far as the protruding wall face. Figure 5.10
Screws
Minimum
4" (102 mm)
Clearance
Ground
Gravel
Drain
Foundation Wall
Window
Well
21
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