Vermont Casting DVRT41 - Manual (Page 19)

19
DVRT41Direct Vent Gas Fireplace
10006740
Below Grade Installation
When it is not possible to meet the required vent
terminal clearances of 12” (305mm) above grade level,
a snorkel kit 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.
Ensure the sidewall venting clearances are ob-
served. If venting system is installed below ground,
we recommend a window well with adequate and
proper drainage to be installed around the termina-
tion area.
If installing a snorkel, a minimum 24” (610mm) vertical
rise is necessary. The maximum horizontal run with the
24” vertical pipe is 36” (914mm). 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 verti-
cal exceeds 24” (610mm).
1. Establish vent hole through the wall (Fig. 31)
2. Remove soil to a depth of approximately 16”
(406mm) below base of snorkel. Install drain pipe.
Install window well (not supplied). Refill hole with
12” (305mm) of coarse gravel leaving a clearance of
approximately 4” (102mm) below snorkel. (Fig. 37)
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” (102mm)
clearance below snorkel. (Fig. 37)
Zero Clearance Sleeve
(if required)
Firestop
7" Pipe
7TDVSNORK
(Snorkel)
4" Clearance Min.
Window Well
Gravel
Drain
Foundation Wall
*A minimum of 24"
(608mm) vertical pipe
must be installed when
using the 7TDVSNORK.
BG402a
24" (608mm)
Minimum*
Screws
Fig. 37 Below grade installation.
Do not back fill around snorkel.
A clearance of at least 4” must be main-
tained between the snorkel and the soil.
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. (Fig. 38)
Snorkel
Wall
Screws
Sheet Metal
Screws
Watertight
Seal Around
Pipe
Foundation
Recess
BG401
Fig. 38 Snorkel installation, recessed foundation.
Vertical Through-the-Roof Application
This gas fireplace has been approved for:
• Vertical installations up to 40’ (12m) in height. Up to
a 10’ (3m) horizontal vent run can be installed within
the vent system using a maximum of two 90
°
elbows. (Fig. 39)
• Up to two 45
°
elbows may be used within the
horizontal run. For each 45
°
elbow used on the
horizontal plane, the maximum horizontal length
must be reduced by 18” (450mm).
Example: Maximum horizontal length:
No elbows = 10’ (3m)
1 x 45
°
elbow = 8.5’ (2.6m)
2 x 45
°
elbows = 7’ (2.1m)
• A minimum of an 8’ (2.5m) vertical rise is required.
• Two sets of 45
°
elbow offsets may be used within
the vertical sections. From 0 to a maximum of 8’
(2.5m) of vent pipe can be used between elbows.
(Fig. 40)
• 7DVCS supports offsets. (Fig. 42) This application
will require that you first determine the roof pitch
and use the appropriate starter kit. (Refer to Venting
Components List)
• The maximum angular variation allowed in the
system is 270
°
. (Fig. 40)
• The minimum height of the vent above the highest
point of penetration through the roof is 2’ (610mm).
(Fig. 43) Refer to note 2, Page 13.