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Innovative Hearth Products
DRT63ST Direct-Vent Gas Fireplaces
Horizontal (Wall) Termination
Systems
This section includes configurations for hori-
zontal venting systems with horizonal termina-
tion (terminates through an outside wall) (see
Figures 32–34 on Pages 26–27).
The tables on Pages 26 and 27 summarize each
system's minimum and maximum vertical and
horizontal length values.
NOTE: Building codes limit or prohibit hori-
zontal termination in specific areas. For loca-
tion guidelines, see Figure 6 on Page 12.
8" DV Lock pipe applications are shown
in the illustrations. 8" DV Lock direct-vent
system components are unitized concentric
pipe components featuring positive twist-lock
connection (see Figure 20 on Page 21). The
appliances covered in this document are fitted
with collars having locking inclined channels.
The dimpled end of the vent components fit
over the appliance collar to create the positive
twist-lock connection.
A. Plan the vent run.
Analyze the vent routing and determine the
types and quantities of sections required.
See Page 20 for a list of available straight vent
sections and their effective lengths (Table 7),
as well as "VENT SECTION LENGTHS" charts.
See Page 42 for a list of all approved venting
components.
Plan the vent lengths so that a joint does not
occur at the intersection of ceiling or roof
joists. Make allowances for elbows as indi-
cated in Figure 22 on Page 22.
Maintain a minimum 1" (26 mm) clearance
to combustibles on the vertical sections.
Clearances for horizontal runs are 4" (102
mm) on top, 1" (26 mm) on sides, and 1"
(26 mm) at the bottom.
B. Frame exterior wall opening.
Locate the center of the vent outlet on the
exterior wall according to the di men -
sions shown in Figure 13 on Page 16.
Cut and/or frame an opening 16" x 13" (406
mm x 330 mm) inside dimensions, with
10" above center and 7" below center.
C. Frame ceiling opening.
If the vertical route is to penetrate a ceiling,
use plumb line to locate the center above the
appliance. Cut and/or frame an opening, 13" x
13" (330 mm x 330 mm) inside dimensions,
about this center (see Figure 19 on Page 21).
D. Attach vent components to appliance.
To attach a vent component to the appliance
collar, align the dimpled end over the collar,
adjusting the radial alignment until the four
locking dimples are aligned with the inlets of
the four incline channels on the collar (see
Figure 20 on Page 21).
24
Horizontal Termination System with Horizontal/Inclined Run
Support
Building
Brackets
Support
Framing
8DVLE90
Elbow
Ceiling
Vertical
Vertical Firestop
Rise
(8DVLVF)
Figure 29
Push the vent component against the collar
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. The unitized design of the 8" DV
Lock components will engage and seal both the
inner and outer pipe elements with the same
procedure. Sealant and securing screws are
not required.
E. Attach vent components to each other.
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 approximately
one-quarter turn until the two sections are fully
locked (see Figure 20). Indentations on the
female end of black painted pipe and fittings will
not be visible unless by examining the inside
of the female ends
F. Install vertical firestop at ceiling.
Install vertical firestop at ceiling - When us-
ing 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.
Remember to maintain 1" (26 mm) clearance
to combustibles, framing members, and attic
or ceiling insulation when running vertical
chimney sections. Insulation shield (F4358)
is required and may be used to help maintain
the clearances indicated here. See installation
accessories on Page 42.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Horizontal / Inclined Run
8DVL6/12/24/36/48
Vent Sections
Support Bracket Spacing
every 3 ft (914 mm)
Min. 2 ft (610 mm) Vertical
Section and One 90° Elbow
Support the vertical portion of the
venting system every 8 ft (2.4 m)
above the fireplace vent outlet.
Fireplace
The gap between the vent pipe and a vertical
firestop can be sealed with non-combustible
caulking.
G. Support the vertical run sections.
See Step E on Page 21.
H. Change vent direction.
At transition from or to a horizontal/inclined run,
install the 8DVLE45 and 8DVLE90 elbows in the
same manner as the straight vent sections. The
elbows feature a twist section to allow them to
be routed about the center axis of their initial
collar section to align with the required direc-
tion of the next vent run element. Twist elbow
sections in a clockwise direction only so as
to avoid the possibility of unlocking any of
the previously connected vent sections (see
Figure 20 on Page 21).
I. Continue installation of horizontal/inclined
sections.
Continue with the installation of the straight vent
sections in horizontal/inclined run as described
in Step E. Install wall support straps every 3
feet (1914 mm) along horizontal/inclined vent
runs using conventional plumber's tape (see
Figure 29).
NOTICE: It is important to install hori-
zontal runs on a steady, (i.e., no "dips"),
slightly positive incline of approximately
1/4" rise-per-foot (20 millimeters rise-
per-meter) horizontal, in a direction
away from the fireplace. (Slightly smaller
rise-per-foot run ratios are acceptable.)
Use a carpenter's level to measure from a
constant surface, and adjust wall support
straps as necessary.
Installation Instructions
900355-01, 01/2020
Termination
(8DVLHT4)
Exterior
Wall
Termination
(8DVLHT4)
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