Below Grade Installation - Majestic 400DVB Installation Instructions Manual

DVB Series Direct Vent Gas Fireplace
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 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. Page 18, Figure 16
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
FP1965
Figure 26 -
FP1965

Below Grade Installation

below grade install
22
Screws
Minimum 4"
Clearance
Ground
Window
Well
Gravel
Drain
Foundation Wall
• Do not back fill around snorkel.
• A clearance of at least 4" must be
maintained between the snorkel and the
soil.
Foundation
Recess
Watertight Seal
Around Pipe
Figure 27 -
Snorkel Installation, Recessed Foundation
FP1966
snorkel
VeNt INstAllAtIoN
Snorkel
Wall Screws
Sheet Metal
Screws
FP1966
54D0701