Vertical Sidewall Applications & Installation - Majestic 33BDVR Installation Instructions And Homeowner's Manual

BDVR Series Direct Vent Gas Fireplace
Finished Wall
Fig. 17 Side view of final unit location.
Vertical Sidewall Applications
Since it is very important that the venting
system maintain its balance between the
combustion air intake and the flue gas
exhaust, certain limitations as to vent
configurations apply and must be strictly
adhered to.
The Vent Graph shows the relationship between
vertical and horizontal side wall venting and will help to
determine the various dimensions allowable.
Minimum clearance between vent pipes
and combustible materials is 1"(25mm)
on top, bottom and sides unless other-
wise noted.
When vent termination exits through foundations less
than 20" below siding outcrop, the vent pipe must flush
up with the siding. It is always 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 to the face of
the outer wall.
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. 18)
•
The maximum number of 90° elbows per side wall
installation is three (3).
14
Vertical Dimension
7¹⁄₂ft. Minimum
When Horizontal
Run is 20ft.
Vent
Termination
CFM141
Fig. 18 Maximum number of 90° elbows is three (3).
•
FP1005
Fig. 19 Maximum horizontal vent run.
15 ft.
(4572mm)
7.5'
(2.3m)
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. 19)
This does not apply if the 90° elbows are used to
increase or redirect a vertical rise. (Fig. 20)
Maximum
3' (914mm)
7TDVRT90
Elbow
Example: According to the chart the maximum
horizontal vent length in a system with a 7.5' (2.3m)
vertical rise is 20' (6 m) and if a 90° elbow is re-
quired in the horizontal vent it must be reduced to
17' (5.2 m). In Figure 21 Dimension A plus B must
not be greater than 17' (5.2 m).
Maximum
20 ft. (6.1m)
48"
12" (1.2m)
(305mm)
7TDVRT90
Elbow
CFM142
10003357