18
Vermont Castings, Majestic Products DVRT36/ 39/ 43
10002428
Below Grade Installation
Step 2
Measure wall thickness and cut zero clearance sleeve
parts to proper length (maximum 12” / 305mm). As-
semble sleeve and attach to firestop with #8 sheet
metal screws (supplied). Install firestop assembly.
(Fig. 28)
Step 3
Place fireplace into position. Measure the vertical
height (X) required from the base of the flue collars to
the center of the wall opening. (Fig. 29)
Step 4
Apply a bead of silicone to the inner and outer flue
collars of the fireplace and using appropriate length of
pipe section(s) attach to fireplace with three (3)
screws. Follow with the installation of the inner and
outer elbow, again securing joints as described in the
‘Connecting Vent Pipe’ section.
Step 5
Measure the horizontal length requirement including a
2” (51mm) overlap; i.e., from the elbow to the outside
wall face plus 2” (51mm), or the distance required if
installing a second 90
°
elbow. (Fig. 30)
Always install horizontal venting on a
level plane.
Step 6
Use appropriate length of pipe sections, telescopic or
fixed, and install. The sections which go through the
wall are packaged with the starter kit, and can be cut to
suit if necessary.
NOTE: Sealing vent pipe and firestop gaps with
high temperature sealant will restrict cold air being
drawn in around fireplace.
Step 7
Apply high temperature sealant to the 4” (102mm) and
7” (175mm) collars only. Guide the 4” and 7” collars of
the vent termination into their respective vent pipes.
Double check that the vent pipes overlap the collars by
2” (51mm). Secure the termination to the wall with
screws provided and caulk around the wall plate to
weatherproof.
Alternatives to screwing the termination directly to the
wall is using either expanding plugs or an approved
exterior construction adhesive. Or, you could attach the
termination with screws through the inner body into the
4” vent pipe, however, for this latter method, extend
the 4” pipe approximately 6” (152mm) beyond the outer
face of the wall.
Support horizontal pipes every 3’
(91cm) with metal pipe straps.
When it is not possible to meet the required vent
terminal clearances of 12” (305mm) above grade level,
a snorkel termination 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.
NOTE: Ensure that sidewall venting clearances are
observed. If venting system is installed below
ground, a window well with adequate and proper
drainage to be installed around the termination
area is recommended.
X
X
FP1181
Fig. 29 Vertical height requirements.
Fig. 30 Horizontal length requirement.
FP1182
X
X
