Below Grade Installations; Vertical Through-The-Roof Applications - Vermont Castings 300DVB(N/P)(V/SC)7SB Installation And Operating Instructions Manual

For models purchased after 4/16/15, please see addendum.
VENTING INSTALLATION

BELOW GRADE INSTALLATIONS

When it is not possible to meet the required vent terminal
clearances of 12" above grade level, a snorkel kit is recom-
mended. 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 recom-
mend 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 neces-
sary. 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 19, Figure
27
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 32
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.
Firestop
7"
Pipe
24" (610 mm)
Minimum
BG402a
BG402a
20306740
Top Vent
Below grade installation
Screws
Snorkel
Minimum 4"
Clearance
Ground
Window
Well
Gravel
Drain
Foundation Wall
Figure 32 -
Below Grade Installation
DVB Series Direct Vent Gas Fireplace
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 32
Do not back fill around snorkel.
A clearance of at least 4" must be maintained
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. Figure 33
Foundation
Recess
Watertight Seal
Around Pipe
Figure 33 -
Snorkel Installation, Recessed Foundation
VERTICAL THROUGH-THE-ROOF
FP1966
APPLICATION
snorkel
his gas fireplace has been approved for:
•
Vertical installations up to 40' (12 m) in height. Up to
a 10' (3 m) horizontal vent run can be installed within
the vent system using a maximum of two 90° elbows.
Figure 32
•
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" (450 mm).
Example: Maximum horizontal length:
No elbows = 10' (3 m)
1 x 45° elbow = 8.5' (2.6 m)
2 x 45° elbows = 7' (2.1 m)
•
A minimum of an 8' (2.5 m) vertical rise is required.
•
Two sets of 45° elbow offsets may be used within the
vertical sections. From 0 to a maximum of 8' (2.5 m) of
vent pipe can be used between elbows. Figure 34
Snorkel
Wall Screws
Sheet Metal
Screws
FP1966
21