How To Use The Vent Graph; Vertical Sidewall Applications & Installation - Majestic 33LDVT Installation Instructions And Homeowner's Manual

LDVT Series Direct Vent Gas Fireplace
Twist Lock Pipes
When using Vermont Castings Group twist-lock pipe it is Vermont Castings Group 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 ends 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
following vent installation instructions to determine the Twist Lock Pipe
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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 the 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).
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twist-lock pipe it is
Female End
TWL100
Fig. 15 Sidewall venting graph. (Dimensions in feet)
The vent graph showing the relationship between vertical
and horizontal side wall venting will help to determine the
various dimensions allowable.
When the vent termination exits through foundations less
than 20" (508mm) 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
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.
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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.
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Vertical Sidewall Applications
Since it is very important that the venting
system maintain its balance between the com-
bustion air intake and the flue gas exhaust,
certain limitations as to vent configurations
apply and must be strictly adhered to.
Minimum clearance between vent pipes and
combustible materials is one 1" (25mm) on top,
bottom and sides unless otherwise noted.
eg: A
eg: B
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