Majestic DV360 Homeowner's Installation And Operating Manual page 15

When vent termination exits through foundations less
than 20" (508mm) below siding outcrop, the vent pipe
must flush up with the siding.
It is best to locate the fireplace in such a way that
minimizes the number of offsets and horizontal vent
length.
The horizontal vent run refers to the total length of vent
pipe from the flue collar of the fireplace (or the top of
the Transition Elbow) to the face of the outer wall.
Horizontal plane means no vertical rise exists on this
portion of the vent assembly.
When installing the appliance as a rear
vent unit, the 90° or 45° Transition Elbow
attached directly to the rear of the unit is
NOT INCLUDED in the following criteria
and calculations, and unless specifically
mentioned should be ignored when
calculating venting layouts.
•
The maximum number of 90° elbows per side wall
installation is three (3). (Fig. 24)
f i r e - p a r t s . c o m
•
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.
25)
•
If a 90° elbow is used in the horizontal vent run
(level height maintained) the horizontal vent length
is reduced by 36" (914mm). (Fig. 26 & 27) This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. (Fig. 24)
3 x 90°
Elbows
Fig. 24 Maximum three (3) 90° elbows per installation.
36"
(914mm)
Max.
Fig. 25 Maximum horizontal run with no rise.
20002261
Vermont Castings Majestic Products DV360/580 Series
3 x 90°
Elbows
FP1176
36"
(914mm)
Max.
FP1177
Example: According to the vent graph (Page 13) the
maximum horizontal vent length in a system with a 7¹⁄₂'
(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).
In Figure 26 & 27, 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. 28)
Example:
Elbow 1
Elbow 2
Elbow 3
Elbow 4
Total angular variation =
A
(2.3m)
Fig. 26 Horizontal run reduction.
A
10'
(254 cm)
8'
(244 cm)
Fig. 27 Maximum vent run with elbows.
= 90°
= 45°
= 45°
= 90°
270°
B
A + B = 17' (Max.)
(5.2m)
7'6"
FP1178
7'
(178 cm)
A + B = 17' Max.
V584-201
B
15