CDV Series Direct Vent Gas Fireplace
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 #7TDVSNORK is required. It allows installation depth of down to 7” (178 mm) below grade level. The 7” is measured from the center of the hori- zontal 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.
Do not back fill around snorkel. A clearance of at least 4” (102 mm) 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 protruding wall face. (Fig. 31)
The maximum horizontal run with 24” vertical rise is 36” (914 mm) from the back of the fireplace to the face of the exterior wall. See vent graph (Page 12) for extended horizontal run if the vertical rise exceeds 24” (610 mm).
1. | Establish vent hole through the wall. (Fig. 13) |
2. | Remove soil to a depth of approximately 16” |
| (406mm) below base of snorkel. Install window |
| well (not supplied). Refill hole with 12” (305 mm) of |
| coarse gravel leaving a clearance of approximately |
Foundation Recess
Recess Brackets
Watertight Seal
Around Pipe
Snorkel
Wall Screws
Sheet Metal
Screws
BG401
| 4” (102 mm) below snorkel. (Fig. 30) |
3. | Install vent system. See Page 12, 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 into the vent pipe and secure to the wall. |
7. | Level the soil to maintain a 4” (102 mm) clearance |
| below snorkel. (Fig. 30) |
Fig. 31 Snorkel installation, recessed foundation.
Vertical Through-the-Roof Applications
This Gas Fireplace has been approved for:
1.Vertical installations up to 40’ (12 m) in height. Up to 10’ (3 m) horizontal vent run can be installed within the vent system using a maximum of three 90° elbows.
7TDVSNORK
(Snorkel)
Maximum
4” (102mm) Clearance
Minimum
10’ (3 m)
Firestop
7” Pipe
24" (610mm)
Minimum*
Min.
Window 
Well
Gravel
Drain
Foundation Wall
*A minimum of 24” (608mm) vertical pipe must be installed when using 7TDVSNORK Kit.
8’ (2.4 m) / Maximum
40’ (12 m) Vertical Rise
Pipe Straps Every 3’ (914 mm)
CFM148
Fig. 32 Support straps for horizontal runs.
2. Up to two 45° elbows may be used within the |
horizontal run. For each 45° elbow used on the |
BG400
Fig. 30 Below grade installation.
horizontal level the maximum horizontal length must |
be reduced by 18” (457 mm). |
18 | 20010175 |
