How To Use The Vent Graph; Rear Wall Venting Applications & Installation - Majestic 33LDVR Installation Instructions And Homeowner's Manual

LDVR Series Direct Vent Gas Fireplace
Twist Lock Pipes
When using MHSC twist-lock pipe it is not necessary to
use sealant on the joints. The only areas of the venting
system that need to be sealed with high temperature
silicone sealant are the sliding joints of any telescopic
vent section used in the system.
To join the twist lock pipes together, simply align the
beads of the male end with the grooves of the female
end, then while bringing the pipe together, twist the pipe
until the flange on the female end contacts the external
flange on the male end. It is recommended that you
secure the joints with three (3) sheet metal screws,
however this is not mandatory with twist lock pipe.
To make it easier to assemble the joints we suggest
putting a lubricant (Vaseline or similar) on the male end
of the twist lock pipe prior to assembly.
Male End
Screw Holes
Fig. 14 Twist-lock pipe joints.

How to Use the Vent Graph

The vent chart should be read in conjunction with the
TWL100
Twist Lock Pipe
following vent installation instructions to determine the
3/12/99 djt
relationship of the vertical and horizontal dimensions of
the vent system.
1. Determine the height of the center of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph (Fig. 15)
locate the point intersecting with slanted graph line.
2. From the point of this intersection, draw a vertical
line to the bottom of the graph.
3. Select the indicated dimension, and position the
fireplace in accordance with same.
Example A:
If the vertical dimension from the floor of the
fireplace is 11' (3.4 m) the horizontal run to the face
of the outer wall must not exceed 14' (4.3 m).
Example B:
If the vertical dimension from the floor of the unit is
7' (2.14 m), the horizontal run to the face of the outer
wall must not exceed 8¹⁄₂' (2.6 m).
14
Female End
TWL100
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Horizontal dimension from the outside face of the
wall to the center of the fireplace vent flange
CFM102
Sidewall vent graph showing the relationship between vertical
DV Graphic
and horizontal dimensions for a Direct Vent flue system.
9/28/00 sta
Fig. 15 Sidewall venting graph. (Dimensions in feet)
Rear Wall Venting Applications
When installed as a rear vent unit this appliance may be
vented directly to a termination located on the rear wall
behind the appliance.
•
Only MHSC venting components are approved to be
used in these applications. (Refer to "Venting Com-
ponents" listed for different installation requirements)
•
The maximum horizontal distance between the rear
of the appliance (or end of the transition elbow in a
corner application) and the outside face of the rear
wall is 20" (508mm). (Fig. 16)
•
Only one 45° elbow is allowed in these installations.
•
Minimum clearances between vent pipe and com-
bustible materials are as follows:
Top - 2" (51 mm)
Sides - 1" (25 mm)
Bottom - 1" (25 mm)
eg: A
eg: B
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