Below Grade Installation - MHSC CDVR33 Installation And Operating Instructions Manual

VENT 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" (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 rec-
ommend 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. Figure 16, page 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
26
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. Figure 26
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 27
Firestop
24"
Minimum
Figure 26 - Below Grade Installation
69D0023
• 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
Foundation
Recess
Watertight Seal
Around Pipe
Figure 27 - Snorkel Installation, Recessed
Foundation
CDV Series Gas Fireplace
Snorkel
Wall Screws
Sheet Metal
Screws
23