Vermont Casting DVBR42 - Manual (Page 16)

16
DVBR Series Direct Vent Gas Fireplace
20000584
V584-201
Horizontal Run
2/99 djt
10’
(254cm)
7’
(178cm)
8’
(244cm)
A
B
A + B = 17’ Max.
V584-201
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 system
is 270°. (Fig. 30)
Example:
Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 270°
1
2
3
4
1
2
3
4
1 + 2 + 3 + 4 = 270°
FP1180
Fig. 30 Maximum elbow usage.
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Fig. 26 Maximum three (3) 90° elbows per installation.
Max 20"
Max 20"
36"
(914mm)
Max.
36"
(914mm)
Max.
FP1177
Fig. 27 Maximum horizontal runwith no rise.
7'6"
A B
90o
A + B = 17' (Max.)
FP1178
Fig. 28 Horizontal run reduction.
• 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 15) the
maximum horizontal vent length in a system with a
7¹⁄₂” (191mm) rise is 20” (508mm) and if a 90° elbow is
required in the horizontal vent it must be reduced to 17’
(5.2m).