Vermont Casting 33XDV Manuel D’Utilisation

20

When it is not possible to meet the required vent ter-
minal clearances of 12” (305 mm) above grade level 
a snorkel kit is recommended.  This 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.
Ensure the 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.
If installing a snorkel, a minimum 24” (610 mm) vertical 
rise is necessary. The maximum horizontal run with the 
24” 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. See the Sidewall 
Venting Graph for extended horizontal run if the vertical 
exceeds 24” (610 mm).
1.  Establish vent hole through the wall. (Fig. 33)
2.  Remove soil to a depth of approximately 16”       

(406 mm) below base of snorkel. 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. 39)

3.  Install vent system. See Page 18, Steps 2 through 5.
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 pipe and secure to the 

wall.

7.  Level the soil to maintain a 4” (102 mm) clearance 

below snorkel. (Fig. 39)

BG402a
Top Vent
Below grade installation
1/26/00   djt

Zero Clearance Sleeve 

(if required)

Screws

7TDVSNORK

(Snorkel)

4” Clear-

ance Min.

Window 

Well

Gravel

Drain

Foundation Wall

*A minimum of 24” (610 mm) 
vertical pipe must be installed 
when using the 7TDVSNORK.

Firestop

7” Pipe

24” (610 mm )

Minimum *

BG402a

Fig. 39  Below grade installation.

If the foundation is recessed, use recess brackets (not 
supplied) for securing lower portion of the snorkel. Fas-
ten 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. 40)

BG401
Snorkel
2/10/99   djt

Snorkel

Wall Screws

Sheet Metal 

Screws

Foundation 

Recess

Watertight Seal 
Around Pipe

BG401

Fig. 40  Snorkel installation, recessed foundation.

This 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. (Fig. 41)

• 

Up to two 45° elbows may be used within the hori-
zontal run. For each 45° elbow used on the horizon-
tal 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’ (2.5m) vertical rise is required.

• 

Two sets of 45° elbow offsets may be used within the 
vertical sections. From 0 to a maximum of 8’ (2.5 m) 
of vent pipe can be used between elbows. (Fig. 42)

• 

7DVCS supports offsets. (Fig. 44) 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 sys-
tem is 270°. (Fig. 42)

• 

The minimum height of the vent above the highest 
point of penetration through the roof is 2’ (610 mm). 
(Fig. 45) Refer to note 2, Page 15.