CDV Series Direct Vent Gas Fireplace
the horizontal vent it must be reduced to 17’ (5.2 m). In Figure 23 Dimension A plus B must not be greater than 17’ (5.2 m).
Maximum
3' (914mm)
7TCDV90
CFM142
Fig. 22 Maximum horizontal vent run.
7 ft.
(2134 mm)
10 ft.
(3048 mm)
90° Elbow = 3 ft.
A + B = 17 ft. (Max.)
7 ft. 6 in.
(2286 mm)
CFM147
Fig. 23 Maximum vent run with elbows.
•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” (45 cm). 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. 24)
•IMPORTANT• Minimum clearance between vent pipes and combustible materials is one (1”) inch (25 mm) on bottom, sides and top.
Twist Lock Vent Starter Kit 7TCRVT, plus Elbow 7TCDV90 must be used in Vertical Sidewall installations.
Canadian & USA Installations:
The venting system must conform with local codes, or in the absence of local codes, with National Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest edition, or CSA B149.1 Installation Code.
Example: |
|
|
|
Elbow 1 | = | 90˚ | 4 |
Elbow 2 | = | 45˚ | |
Elbow 3 | = | 45˚ |
|
Elbow 4 | = | 90˚ |
|
Total angular variation = 270˚
1 + 2 + 3 + 4 = 270o
3 
2
1
CFM132
Fig. 24 Maximum number of elbows.
Only CFM Corporation venting components specifically approved and labelled for this fireplace may be used.
Vertical Sidewall Installation
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 noncombustible, cut opening to size. (Fig. 25)
For combustible walls first frame in opening.
Combustible Walls (Fig. 25): Cut a 9³⁄₈”H x 9³⁄₈” W (240 x 240 mm) hole through the exterior wall and frame.
Noncombustible Walls (Fig. 25): Hole opening must be 7.5” (190 mm) in diameter.
Vent Opening for Combustible Wall
9³⁄₈”
(240mm)
9³⁄₈”
(240mm)
Framing Detail
Fireplace Hearth
Opening for Noncombustible Wall
7¹⁄₂”
(190mm)
Fig. 25 Locate vent opening on wall.
16 | 20010175 |