NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
21
Innovative Hearth Products
Montebello
®
ST Direct-Vent Gas Fireplaces
Installation Instructions
900355-00, 06/2016
B. Attach vent components to appliance.
Secure Vent® SV8 direct-vent system com-
ponents are unitized concentric pipe compo-
nents 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.
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 inlet of
the four inclined channels on the collar (
refer
to Figure 20).
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 Secure Vent 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.
C. Attach vent components to each other.
Other vent sections may be added to the pre-
viously 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 installed section,
adjusting the radial alignment until the four
locking dimples are aligned with the inlets of
the four incline channels 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.
Figure 20
Align four dimples in upper vent
section with inlets of four locking
incline channels on lower vent
section or appliance collar.
Twist upper vent section clockwise
until arrows and dimples align.
Dimple
Locking
Incline
Channel
Connected Vent
Sections
Arrow
Arrow
Lower Vent Section or Appliance Collar
Min. 13”
(330 mm)
Min. 13”
(330 mm)
Roof Framing
Ceiling Framing
Plumb Bob
Figure 19
D. Install firestop/spacer at ceiling.
When using Secure Vent, use SV8BF firestop/
spacer at ceiling joists. If there is living space
above the ceiling level, the firestop/spacer
must be installed on the bottom side of the
ceiling. If attic space is above the ceiling, the
firestop/spacer must be installed on the top
side of the joist.
Route the vent sections through the framed
opening and secure the firestop/spacer 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 mem-
bers, and attic or ceiling insulation. Attic
insulation shield (H3908) 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 support straps to the vent pipe.
See
Figure 21.
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
combinations. Elbows are available in 90° and
45° configurations. See
Figure 22
on
Page 22
for the SV8E45 and SV8E90 elbow dimensional
specifications.
Where required, a telescopic vent section
(SV8LA) 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 SV8LA Telescopic Vent Section has
an effective length of from 1-1/2" (38 mm) to
6-3/4" (171 mm). The SV8LA 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 SV8 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
).
Figure 21
Blocking
Support Straps
(Plumber’s
Tape)
Max.
8 ft (2.4 m)
0" (0 mm)
minimum
clearance
to spacers
