Horizontal Termination Configurations - Majestic 400DVB Installation Instructions Manual

DVB Series Direct Vent Gas Fireplace

hoRIZoNtAl teRMINAtIoN coNFIGuRAtIoNs

since it is very important that the venting system maintain its bal-
ance 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, showing the relationship between vertical and hori-
zontal side wall venting, will help to determine the various dimensions
allowable. Figure 20
NOTE: Horizontal sections of this vent system require a minimum of
3" clearances to combustibles at the top of the flue and 1" clearance
at the sides and bottom until the flue penetrates the outside wall.
A minimum 1" clearance all around the flue is acceptable at this
point of penetration.
Vertical sections of this vent system require a minimum of 1"
clearance to combustibles on all sides of the pipe.
When vent exits through foundations less than 20" below outcrop, the
termination must be flush up with outcropped wall above.
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.
•
The maximum number of 90° elbows per side wall installation
is three (3). Figure 21
•
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" (914 mm). Figure 22
3 x 90°
Elbows
Figure 21 -
Maximum Three (3) 90°
Elbows per Installation
FP1176
20
max 90 bends
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.
3 x 90°
Elbows
FP1176
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
20"
Horizontal Dimension from the Outside of
Termination to the Back of the Fireplace
Figure 20 -
Rear Wall Venting Graph
36"
(914 mm)
Max.
FP1177
Figure 22 -
Maximum Horizontal Run with No Rise
VeNt INstAllAtIoN
Dimensions in
Feet
eg: A
8
6
4
2
2 4 6 8 10 12 1 4 16 18 2 0
FP2248
sidewall vent graph
(914 mm)
36"
Max.
54D0701