17
TDVN Series Direct Vent Gas Fireplace
20007636
Below Grade Installations
When it is not possible to meet the required vent ter-
minal clearances of 12” (305 mm) above grade level a
snorkel vent kit is recommended. It allows installation
depth of down to 7” (178 mm) below grade level. The
7” is measured from the center of the horizontal vent
pipe as it penetrates through the wall.
If venting system is installed below
ground, we recommend a window well with
adequate and proper drainage.
Ensure sidewall venting clearances are observed.
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” (914 mm). This
measurement is taken from the collar of the fireplace (or
transition elbow) to the face of the exterior wall. Refer to
the Sidewall Vent Graph for extended horizontal run if
the vertical rise exceeds 24” (610 mm).
1. Establish vent hole through the wall. (Fig. 17)
2. Remove soil to a depth of approximately 16”
(406mm) below base of snorkel. Install drain pipe.
Do not back fill around snorkel. A clear-
ance of at least 4” (102 mm) must be main-
tained between 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 protruding wall
face. (Fig. 27)
BG402a
Top Vent
Below grade installation
1/26/00 djt
Firestop
7” Pipe
7TDVSNORK
(Snorkel)
4” (102 mm)
Clearance
Min.
Window
Well
Gravel
Drain
BG402
Fig. 26
Below grade installation.
Zero Clearance Sleeve
(if required)
*A minimum of 24” (610mm) ver-
tical pipe must be installed when
using the 7TDVSNORK Kit.
*The 22” (559 mm) vertical rise
(center to center) of the snorkel
may be included for calculationof
max. horizontal run.
24” (610 mm)
Minimum*
Screws
Foundation Wall
6
¹⁄₂
" (165mm)
FP1475
flex 90 bend
4/04 djt
FP1475
Fig. 25
Bend flex vent at 90° so horizontal portion is 6
¹⁄₂
”
(165mm) off top of unit.
Step 4
Install the 4” (102 mm) flex vent pipe to the termination
cap collar as described on Page 11.
Step 5
Slide the 7” (178 mm) flex vent pipe over the 4” flex
vent pipe and secure the 7” collar as described on Page
11.
Step 6
Bend the flex pipe horizontal so the bottom of the hori-
zontal pipe measure 6
¹⁄₂
” (165 mm) from the top of the
unit immediately after the 90° formation. (Fig. 25) Be
sure to follow the 1/2” (13 mm) rise in a 12” (305 mm)
horizontal run rule.
Step 7
Trim off excess vent material, then install the 4” flex to
the flue collar and the 7” flex to the appliance collar.
Secure venting with band clamps provided.
Install window well (not supplied). Refill hole with 12”
(305 mm) of coarse gravel leaving a clearance of
approximately 4” (102 mm) below snorkel. (Fig. 23)
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 to maintain a 4” (102 mm) clearance
below snorkel. (Fig. 26)
BG401
Snorkel
2/10/99 djt
Snorkel
Wall Screws
Foundation
Recess
Water-
tight Seal
Around
Pipe
Sheet Metal
Screws
BG401
Recess
Brackets
Fig. 27
Snorkel installation, re-
cessed foundation.
