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Vermont Castings, Majestic Products
14 DVR33 10002823/0
HOW TO USE THE VENT GRAPH
The Vent Graph should be read in conjunction with the follow-
ing vent installation instructions to determine the relationship
between the vertical and horizontal dimensions of the vent
system.
1. Determine the height of the centre of the horizontal vent
pipe exiting through the outer wall. Using this dimension
on the Sidewall Vent Graph below, locate the point it
intersects 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 replace
in accordance with same.
EXAMPLE A:
If the vertical dimension from the oor of the replace 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 oor of the replace is
7' (214cm), the horizontal run to the face of the outer wall
must not exceed 8-1/2' (2.6 m).
VERTICAL SIDEWALL APPLICATIONS
Since it is very important that the venting system
maintain its balance between the combustion air
intake and the ue gas exhaust, certain limita-
tions as to vent congurations apply and must
be strictly adhered to.
The Sidewall Vent Graph, showing the relationship between
vertical and horizontal venting dimensions will help to deter-
mine the various vent lengths allowable.
Minimum clearance between vent pipes and
combustible materials is one 1"(25mm) on top,
bottom and sides unless otherwise noted.
When vent termination exits through foundations less than 20"
(508 mm) below siding outcrop, the vent pipe must ush up
with the siding.
It is always best to locate the replace 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 ue collar of the replace to the face of the outer
wall.
Horizontal plane means no vertical rise exists on this portion
of the vent assembly.
When installing a rear vent unit the 90º Transi-
tion Elbow attached directly to the rear of the
unit is not included in the following criteria and
calculations, and unless specically mentioned
should be ignored when calculating venting lay-
outs.
• The maximum number of 90º elbows per side wall instal-
lation is three (3).
Fig. 18