VENT INSTALLATION
BELOW GRADE INSTALLATIONS — RIGID VENTING
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.
1. Establish vent hole through the wall.
See Figure 12, page 17.
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.
Figure 24 - Snorkel Installation,
Recessed Foundation
Figure 23 - Below Grade Installation
Screws
Minimum
4" Clearance
Ground
Window Well
Gravel
Drain
Foundation Wall
Firestop
Foundation
Recess
Watertight Seal
Around Pipe
Sheet Metal
Screws
Wall Screws
Snorkel
• Do not back fill around snorkel.
• A clearance of at least 4" must be maintained
between the snorkel and the soil.
WARNING
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
1
/
2
sheet metal screws. It will be necessary to extend vent pipes out as far as the
protruding wall face.
See Figure 24.
20
21
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.
6
. Level the soil so as to maintain a 4" clearance below snorkel.
See Figure 23.
12
"
Minimum
If installing a snorkel, a minimum
18
" vertical rise is necessary. The maximum horizontal run with the
18
” vertical pipe is 3
2
".
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
18
".
