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Innovative Hearth Products
DRT63ST Direct-Vent Gas Fireplaces
Vertical Termination System
with Offset Vertical Venting
NOTE: If not already done, install the
provided vent restrictor before proceed-
ing (see Page 19).
Analyze the vent routing and determine the
quantities of vent sections and number of
elbows required. Refer to Vertical Termination
System Figures and Tables on Page 23 to
select the type of vertical installation desired.
Vent sections are available in net lengths of
4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2"
(572 mm), 34-1/2" (876 mm) and 46-1/2" (1181
mm). Refer to the Vent Section Length Chart
on Page 20 for an aid in selecting length com-
binations. Elbows are available in 90° and 45°
configurations. See Figure 22 on Page 22 for
the 8DVLE45 and 8DVLE90 elbow dimensional
specifications.
Where required, an adjustable DV length sec-
tion (8DVLAL) may be used to provide the
installer with an option in installing in tight
and confined spaces or where the vent run
made up of fixed length pieces develops a joint
in a undesirable location, or will not build up
to the required length. The 8DVLAL adjustable
DV length section has an effective length of
from 1-1/2" (38 mm) to 7-3/4" (197 mm). The
8DVLAL is fitted with a dimpled end (identical
to a normal vent section component) and a
plain end with 3 pilot holes. Slip the dimpled
end over the locking channel end of a standard
8DVL vent component the required distance
and secure with three screws.
Maintain a minimum 1" (26 mm) clearance
to combustible materials for all vertical ele-
ments. Clearances for all horizontal elements
are 4" (102 mm) on top, 1" (26 mm) on sides
and 1" (26 mm) on the bottom.
A. Frame ceiling opening.
Use a plumb line from the ceiling above the
appliance to locate center of the vertical run.
Cut and/or frame an opening, 13" x 13" (330
mm x 330 mm) inside dimensions, about this
center mark (Figure 19).
Roof Framing
Min. 13"
(330 mm)
Plumb Bob
Ceiling Framing
Figure 19
B. Attach vent components to appliance.
8" DV Lock (8DVL) direct-vent system compo-
nents are unitized concentric pipe components
featuring positive twist lock connections (see
Figure 20).
All of the appliances covered in this document
are fitted with collars having locking inclined
channels. The dimpled end of the vent com-
ponents fit over the appliance collar to create
the positive twist-lock connection.
Figure 20
Joint Connection - 8" DV LOCK Direct Vent
components are engineered for easy twist
lock assembly. Eight indentations are located
on the female end of pipe and fittings to slide
straight into the male end of the adjacent pipe
or fitting, by orientating the eight indentations
so they match and slide into the eight entry
slots on the male ends.
Push the pipe sections completely together,
then twist lock one section clockwise approxi-
mately one-quarter turn until the two sections
are fully locked (see Figure 17). Indentations
on the female end of black painted pipe and
fittings will not be visible unless by examining
the inside of the female ends.
The unitized design of the 8" DV Lock com-
ponents will engage and seal both the inner
and outer pipe without the need for sealant or
screws. If desired, a #6 x 1/2" screw may be
used at the joint, but it is not required, as the
pipe will securely lock when twisted.
Min. 13"
C. Attach vent components to each other.
(330 mm)
Other vent sections may be added to the previ-
ously installed section in accordance with the
requirements of the vertical vent figures and
tables. To add another vent component to a
length of vent run, align the dimpled end over
the inclined channel end of the previously in-
stalled section, adjusting the radial alignment
until the eight female end indentations are
aligned with the male end entry slots of the
previous section.
Push the vent component against the previous
section until it fully engages, then twist the
component clockwise, running the dimples
down and along the incline channels until they
seat at the end of the channels. This seating
position is indicated by the alignment of the
arrow and dimple as shown in Figure 20.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Installation Instructions
900355-01, 01/2020
D. Install vertical firestop at ceiling.
When using 8" DV Lock, use 8DVLVF vertical
firestop at ceiling joists. If there is living space
above the ceiling level, the vertical firestop
must be installed on the bottom side of the
ceiling. If attic space is above the ceiling, the
vertical firestop must be installed on the top
side of the joist.
Route the vent sections through the framed
opening and secure the firestop with 8d nails
or other appropriate fasteners at each corner.
When running vertical chimney sections,
remember to maintain 1" (26 mm) clearance
to combustibles, framing members, and
attic or ceiling insulation. Insulation shield
(F4358) is required and may be used to help
maintain the clearances indicated here. See
installation accessories on Page 42. The
gap between the vent pipe and a vertical
firestop can be sealed with non-combustible
caulking.
E. Support vertical vent run sections.
NOTE: Proper venting support is very im-
portant. The weight of the vent must not be
supported by the fireplace in any degree.
Support the vertical portion of the venting
system every 8 feet (2.4 m) above the fireplace
vent outlet.
One method of support is conventional
plumber's tape (not provided). Secure the
plumber's tape to the framing members with
nails or screws.
Loop the plumber's tape around the vent,
securing the ends of the tape to the framing.
If desired, use #6 x 1/2" sheet metal screws
to secure the wall support straps to the vent
pipe. See Figure 21.
Wall support
straps
(Plumber's Tape)
Max.
8 ft (2.4 m)
0" (0 mm)
minimum
clearance
to spacers
Figure 21
Blocking
21
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