23
CDVZ Series Direct Vent Gas Fireplace
20014621
Since it is very important that the venting
system maintain its balance between the com-
bustion air intake and the flue gas exhaust,
certain limitations as to vent configurations
apply and must be strictly adhered to.
The vent graph showing the relationship between
vertical and horizontal side wall venting will help to deter-
mine the various dimensions allowable.
Minimum clearance between vent pipes and combustible
materials is one 1” (25 mm) on top, bottom and
sides unless otherwise noted.
When the vent termination exits through founda-
tions less than 20” (508 mm) below siding outcrop,
the vent pipe must flush up with the siding.
It is always best to locate the fireplace in such a way
that minimizes the number of offsets and horizontal vent
length. The horizontal vent run refer to the total length of
vent pipe from the flue collar of the fireplace to the face of
the outer wall.
Vertical Sidewall Applications
FP1012
Top vent max run
1/25/00 djt
20' (6m)
7.5' (2.3m)
Pipe Straps
Every 3’ (914 mm)
Firestop/Zero
Clearance Sleeve
Pipe
Straps Every
3’ (914 mm)
FP1012
Fig. 45
Support straps for horizontal runs.
Horizontal plane means no vertical rise exists on this por-
tion of the vent assembly.
•
The maximum number of 90° elbows per side wall
installations is three (3).
•
A 12” (305 mm) vertical section off the top of the unit is
required before a 90° elbow may be used. The maximum
horizontal vent run before the termination or a vertical
rise is 36” (914 mm).
•
If a 90° elbow is used in the horizontal vent run (level
height maintained) the maximum horizontal vent length
is reduced by 36” (914 mm). This does
not ap-
ply if the 90° elbows are used to increase or redirect a
vertical rise.
Example:
According to the chart the maximum
horizontal vent length in a system with a 7.5’ (2.3 m)
vertical rise is 20’ (6 m) and if a 90° is required in the
horizontal vent it must be reduced to 17’ (5.2 m).
In Figure 46, Dimension A plus B must not be greater
than 17’ (5.2 m).
•
The maximum number of 45° elbows permitted per side
wall installation is two (2). These elbows can be installed
in either the vertical or horizontal run.
•
For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18”
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
•
The maximum number of elbow degrees in a system is
270°. (Fig. 48)
3'
(914mm)
FP1237a
horizontal plane
12”
(305 mm)
FP1237a
Fig. 46
Maximum horizontal vent run.
7.5'
(2.3m)
A
B
A + B = 17' (5.2m) Max.
1 x 90° elbow in horizontal plane = 3’ (914mm)
FP1238
Fig. 47
Maximum vent run with elbows.
STEP 1
Locate vent opening on the wall. It may be necessary to first
position the fireplace and measure to obtain hole location.
Depending on whether the wall is combustible or noncom-
bustible, cut opening to size. (Fig. Page 13, Fig. 17)
For combustible walls first frame in opening.
Combustible Walls:
(Fig. 17) Cut a 9
³⁄₈
”H x 9
³⁄₈
”W (240
x 240 mm) hole through the exterior wall and frame as
shown. or 7TCRVT1320 cut a 10
³⁄₈
”H x 9
³⁄₈
” W (264 x 240
mm) hole.
Noncombustible Walls:
(Fig. 17) Hole opening must be
7
¹⁄₂
” (190 mm) in diameter.
Vertical Sidewall Installations
