Vermont Casting RFSDV24 - Manual (Page 11)

11
RFSDV24/34 Freestanding Direct Vent Gas Fireplace
10003550
Example: According to the chart the maximum
horizontal vent length is 20’ (6 m). However, if a
90° elbow is used in the horizontal vent, maximum
horizontal vent length is reduced to 17’ (5.2 m).
In Figure 9, the total of Dim. A and Dim. B must not
exceed 17’ (5.2 m).
• The maximum number of 45° elbows permitted per
installation is six (6). 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. 12)
Example:
Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 270°
1 + 2 + 3 + 4 = 270°
FP1239
Fig. 12 Maximum elbow usage.
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. 13)
For combustible walls first frame in opening.
Combustible Walls: (Fig. 13) Cut a 9³⁄₈”H x 9³⁄₈”W (240
x 240 mm) hole through the exterior wall and frame as
shown.
Noncombustible Walls: (Fig. 13) Hole opening must
be 7¹⁄₂” (190 mm) in diameter.
Vertical Sidewall Installations
VO584-100
Vent Opening
2/99 djt
Vent Opening for Combustible Wall
9³⁄₈”
(240mm)
9³⁄₈”
(240mm)
Fireplace Hearth
Framing
Detail
Opening for Noncombustible Wall
7¹⁄₂”
(190mm)
VO584-100
Fig. 13 Locate vent opening on wall.
7.5ʼ
(2286 mm)
FSDV 2 elbow 20 appl.
rev 0602 rjs
A + B =17’ (5.2 m) Max.
FP1496
Fig. 10 90° elbow used in horizontal vent run.
20ʼ
(6 m)
7.5ʼ
(2. m)
rev 0602 rjs
Pipe Straps
Every 3’ (914 mm)
Pipe Straps Every 3’
(914 mm)
Firestop / Zero
Clearance Sleeve
FP1497
Fig. 11 90° elbow used to increase height.