Below Grade Installations - Majestic 360DVS2 Installation Instructions & Homeowner's Manual

STEP 6
Use appropriate length of pipe section—telescopic or
fixed—and install. The 20" (508 mm) section of pipe
which goes through the wall is packaged with the
7DVSK starter kit, and can be cut to suit if necessary.
Seal vent pipe and firestop gaps with high temperature
sealant to restrict cold air being drawn in around the
fireplace.
STEP 7
Apply high temperature sealant to 4" (102 mm) and
7" (178 mm) collars, or to the termination 1" (25 mm)
away from the crimped end. Guide 4" and 7" collars of
vent terminations into respective vent pipes. Double
check vent pipes to see that they overlap the collars by
2" (51 mm). Secure termination to the wall with screws
provided, and caulk around the wall plate to
weatherproof.
One alternative to screwing the termination directly to
the wallis the use of expanding plugs or an approved
exterior construction adhesive.
Or, you may attach the termination with screws through
the inner body into the 4" (102 mm) vent pipe; however,
for this method, you must extend the 4" (102 mm) pipe
approximately 6" (153 mm) beyond the outer face of
the wall.
Support the horizontal pipes with metal
pipe straps every 3' (91 cm).

Below Grade Installations

When it is not possible to meet required vent terminal
clearances of 12 in. (305 mm) above grade level, we
recommend using a starter kit. It allows installation
depth down to 7 in. (178 mm) below grade level.
Measure 7 in. (178 mm) from the center of the
horizontal vent pipe as it penetrates through the wall.
NOTE: Ensure sidewall venting clearances are
observed. If venting system is installed
below ground, we recommend a window
well with adequate and proper drainage.
If installing a snorkel, a minimum 24 in. (610 mm)
vertical rise is necessary. The maximum horizontal run
with 24 in. (610 mm) vertical pipe is 36 in. (915 mm).
The measurement is taken from the collar of the
fireplace (or transition elbow) to the face of exterior
wall. See sidewall vent graph, page 15, for extended
horizontal runs if the vertical exceeds 24 in. (610 mm).
1. Establish vent hole through the wall (Fig. 24).
2. Remove soil to depth of about 16 in. (406 mm)
below base of snorkel. Install window well (not
supplied). Refill hole with 12 in. (305 mm) of coarse
gravel, leaving a clearance of about 4 in. (102 mm)
below snorkel (Fig. 28).
3. Install vent system.
4. Ensure a watertight seal is made around the vent
pipe coming through the wall.
10002547
Vermont Castings, Majestic Products, 360DVS Series
5. Apply high-temperature sealant caulking (supplied)
around 4 in. and 7 in. snorkel collars.
6. Slide snorkel into vent pipes and secure to wall.
7. Level the soil so as to maintain a 4 in. (102 mm)
clearance below snorkel (Fig. 29).
ZERO CLEARANCE
SLEEVE IF REQUIRED
FIRESTOP
7" PIPE
24" (608 mm)
MINIMUM*
Fig. 29 Below grade installation
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 sheetmetal screws. It will be
necessary to extend vent pipes out as far as protruding
wall face (Fig. 30).
Foundation recess
Fig. 30 Snorkel installation/ recessed foundation
SCREWS
FOUNDATION WALL
A minimum of 24" (608 mm)
vertical pipe must be installed when
using the 7DVSKS/7TDVSKS kit.
The 22" (559 mm) vertical rise
(center to center) of the snorkel may
be included for calculation of
maximum horizontal run.
Do not backfill around the snorkel. A
clearance of at least 4" (102 mm) must
be maintained between the snorkel and
the soil.
Watertight seal
Sheet metal screws
around pipe
7DVSKS
(SNORKEL)
MINIMUM
4" (102 mm)
CLEARANCE
(GROUND)
WINDOW WELL
GRAVEL
DRAIN
Universal snorkel
Snorkel
Wall screws
CFM139
19