Vermont Castings DVRT41 Homeowner's Installation And Operating Manual page 16

DVRT41 Direct Vent Gas Fireplace
•
The maximum number of 90° elbows per side wall
installation is three (3). (Fig. 2)
•
If a 90° elbow is fitted directly on top of the fireplace
flange the maximum horizontal vent run before the
termination or a vertical rise is 36" (914mm). (Fig.
27)
3 x 90°
Elbows
Fig. 26 Maximum three (3) 90° elbows per installation.
36"
(914mm)
Max.
Fig. 27 Maximum horizontal run with no rise.
•
If a 90° elbow is used in the horizontal vent run
(level height maintained) the horizontal vent length
is reduced by 36" (914mm). (Fig. 28 & 29) This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. (Fig. 26)
Example: According to the vent graph (Page 13) the
maximum horizontal vent length in a system with a 7 '
(2.3m) rise is 20' (6m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17' (5.2m).
A
(2.3m)
Fig. 28 Horizontal run reduction.
16
3 x 90°
Elbows
FP1176
36"
(914mm)
Max.
FP1177
B
A + B = 17' (Max.)
(5.2m)
7'6"
FP1178
A
10'
(254 cm)
8'
(244 cm)
Fig. 29 Maximum vent run with elbows.
In Figure 28 & 29, dimension A plus B must not be
greater than 17' (5.2m)
•
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" (457mm). 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 sys-
tem is 270°. (Fig. 30)
Example:
Elbow 1
Elbow 2
Elbow 3
Elbow 4
Total angular variation =
1 + 2 + 3 + 4 = 270°
1
2
3
4
Fig. 30 Maximum elbow usage.
7'
(178 cm)
A + B = 17'
(518cm) Max.
V584-201
= 90°
= 45°
= 45°
= 90°
270°
1
2
3
4
FP1180
10006740
B