Vermont Casting DVR33 - Manual (Page 17)

17
Vermont Castings, Majestic Products: DVR33
10004920
Fig. 27 Horizontal length requirement.
Below Grade Installation
CFM193
Fig. 28 Below grade installation.
Do not backfill around snorkel.
A clearance of at least 4” (102 mm) must
be maintained between the snorkel and
the soil.
Step 7
Apply high temperature sealant to 4” (100 mm) and 7”
(175 mm) collars or the termination one inch away from
crimped end. Guide the vent terminations 4” and 7”
collars into their respective vent pipes. Double check
that the vent pipes overlap the collars by 2” (50 mm).
Secure the termination to the wall with screws provided
and caulk around the wall plate to weatherproof.
As an alternative to screwing the termination directly to
the wall, you may also use expanding plugs or an
approved exterior construction adhesive. Or, you may
attach the termination with screws through the inner
body into the 4” vent pipe—however, for this method,
you must extend the 4” pipe approximately 6”
(150 mm) beyond the outer face of the wall.
Support horizontal pipes every 3’
(91 cm) with metal pipe straps.
If installing a snorkel, a minimum 24” (610 mm) vertical
rise is necessary. The maximum horizontal run with the
24” (610 mm) vertical pipe is 36” (915 mm). 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” (610 mm).
1. Establish vent hole through the wall (Fig. 24,
page 16).
2. Remove soil to a depth of approximately 16”
(406 mm) below base of snorkel. Install drain pipe.
Install window well (not supplied). Refill hole with
12” (305 mm) of coarse gravel leaving a clearance
of approximately 4” (100 mm) below snorkel
(Fig. 28).
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
(100 mm) below snorkel (Fig. 28).
Gravel
Drain
Firestop
Foundation wall
Window
well
7DVSKS
(Snorkel)
Ground
24" (608 mm)
min.*
Minimum 24" (608 mm)
vertical pipe must be installed
when using 7DVSKS Kit. *
7" pipe
Screws
Min. clearance
4" (102 mm)
Zero Clearance Sleeve,
if required
When it is not possible to meet the required vent terminal
clearances of 12” (305 mm) above grade level, a Snorkel
Vent Kit #7DVSKS 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.
NOTE: Ensure that sidewall venting clearances
are observed. If the venting system is
installed below ground, we recommend
a window well with adequate and proper
drainage to be installed around the
termination area.
CFM137
High Temperature
Sealant
X