Vermont Casting DBT36 - Manual (Page 11)

10002789/0 -11- DBT33/DBT36/DBT39
H
OW
T
O
U
SE
T
HE
V
ENT
G
RAPH
The vent chart should be read in conjunction with the follow-
ing vent installation instructions to determin the relationship of
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 re
place 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 re
place is 7' (214cm), the horizontal run to the face of
the outer wall must not exceed 8-1/2' (2.6 m).
G
ENERAL
I
NFORMATION
O
N
A
SSEMBLING
DV C
OMPONENTS
Crimped End Pipes
Before joining elbows and pipes apply a bead of high tempera-
ture sealant to the crimped end of the elbow or pipe.
Join the pipes using a 2" (50 mm) overlap and secure the
joints with three sheet metal screws, Fig. 16. Wipe off excess
sealant.
CANADIAN INSTALLATIONS:
The venting system must be installed in accordance with the
current CAN/CGA-B149 (.1 or .2) installation code.
U.S.A. INSTALLATIONS:
The venting system must conform to local codes and/or the
current National Fuel Code ANSI Z223.1.
Only venting components manufactured by CFM Majestic Inc.
can be used in Direct Vent systems.
Twist Lock Pipes
When using CFM Majestic Inc. 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 collars on the
replace and termination, and the sliding joint of any tele-
scopic 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 pipes together, twist the pipe until the ange on
the female end contacts the external ange on the male end.
It is recommended that you secure the joints with three 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.
Fig. 16
Fig. 17 NOTE: When a 90º elbow is installed directly to the top
collar, the max. hori zontal run is 3ft.
(See Fig. 19).