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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" 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 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. See Figure 21.
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.
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. See Figure 21.
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 #8x
far as the protruding wall face. See Figure 22.
Firestop
1"
Minimum
Figure 21 - Below Grade Installation
74D0010
• Do not back fill around snorkel.
• A clearance of at least 4" must be maintained between the
snorkel and the soil.
Screws
Minimum
4" Clearance
Ground
Window Well
Gravel
Drain
Foundation Wall
1
/
sheet metal screws. It will be necessary to extend vent pipes out as
2
Foundation
Recess
Watertight Seal
Around Pipe
Figure 22 - Snorkel Installation,
VENT INSTALLATION
Sheet Metal
Recessed Foundation
Snorkel
Wall Screws
Screws
1
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