Majestic fireplaces 33LDVR Installation Instructions And Homeowner's Manual page 15

Horizontal plane means no vertical rise exists on this
portion of the vent assembly.
•
The maximum horizontal vent run is 20 ft. (6.1m)
when the vertical vent rise is 7¹⁄₂ ft. (2.3m). (Fig. 21)
•
The maximum number of 90° elbows per side wall
installation is three (3).
Vertical Dimension
7¹⁄₂ʼ Minimum When
Horizontal Run is
20ʼ
7.5'
(2.3m)
CFM141
Fig. 21 Maximum number of 90° elbows is three (3).
•
If a 90° elbow is used in the horizontal vent run
(level height maintained) the maximum horizontal
vent length is reduced by 36" (914 mm). (Fig. 22)
This does not apply if the 90° elbows are used to
increase or redirect a vertical rise. (Fig. 23)
Fig. 22 Maximum horizontal vent run.
Example: According to the chart the maximum hori-
zontal vent length in a system with a 7.5ʼ (2.3m) ver-
tical rise is 20ʼ (6 m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17ʼ (5.2 m).
In Figure 23 Dimension A plus B must not be greater
than 17ʼ (5.2 m).
•
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
10007317
Maximum
20 ft. (6.1m)
48"
12" (1.2m)
(305mm)
15 ft.
(4572mm)
7TDVRT90
Elbow
CFM141
2/2/01 sta
Maximum
3' (914mm)
7TDVRT90
Elbow
CFM142
Venting
2/2/01 sta
LDVR Series Direct Vent Gas Fireplace
7 ft. 6 in.
(2286 mm)
Fig. 23 Maximum vent run with elbows.
18" (45cm). 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)
Example:
Elbow 1
Elbow 2
Elbow 3
Elbow 4
Total angular variation = 270˚
Fig. 24 Maximum number of elbows.
•IMPORTANT• Minimum clearance between vent
pipes and combustible materials is one (1") inch (25 mm)
CFM142
on bottom, sides and top.
Twist Lock Vent Starter Kit 7TDVSK, plus
Transition Elbow 7TDVRT90 must be used
in Vertical Sidewall installations. The 4"
pipe must be centered inside the 7" pipe
coming off the transition elbow.
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.
Only CFM Corporation venting components specifically
approved and labelled for this fireplace may be used.
10 ft.
(3048 mm)
90° Elbow = 3 ft.
A + B = 17 ft. (Max.)
V584-201
Horizontal Run
2/99 djt
= 90˚
4
= 45˚
= 45˚
= 90˚
o
1 + 2 + 3 + 4 = 270
3
2
1
CFM132
Insert Rear Vent Sidewall
2/26/01 sta
7 ft.
(2134 mm)
CFM147
CFM132
15