Installation
900960-00C, 06/2019
Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
23
Model
Effective Length
SV4.5L6
4-1/2”
SV4.5L12
10-1/2”
SV4.5L24
22-1/2”
SV4.5L36
34-1/2”
SV4.5L48
46-1/2”
Vent Restrictor with Vertical Terminations
When vertically terminating the vent system through the roof and using the vent restrictor, install the vent restrictor
in the top vent of the fireplace outlet.
If installing more than 6 ft of vertical venting, install the restrictor (
Figure 12
), from inside or outside the unit, in the
inner fireplace collar. The vent restrictor is held in place by friction.
Vent Restrictor with Horizontal Terminations
When horizontally terminating a vent system with a vertical vent run up to 6 ft through an exterior wall, no vent
restrictor is required.
If installing more than 6 ft of vertical venting, install the restrictor (
Figure 13
), from inside or outside the unit, in the
inner fireplace collar. The vent restrictor is held in place by friction.
NOTE
: Use the minimal horizontal vent restrictor
when rear venting with only a slip collar and a termination.
10.
Connecting the Vent Pipe
Secure Vent
®
SV4.5 direct-vent system components are unitized concentric pipe components featuring positive twist
lock connections (
Figures 15A - 15B
). All of the fireplaces covered in this document are fitted with collars having
locking inclined channels. The dimpled end of the vent components fit over the fireplace/vent collar to create the
positive twist lock connection.
1. Align the dimpled end over the collar, adjusting the radial alignment until the four (4) locking dimples are aligned
with the inlet of the four (4) inclined channels on the collar (
Figures 15A - 15B
).
2. 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.
NOTE: The unitized design of the Secure Vent
®
components will engage and seal both the inner and outer vent pipe.
3. If desired, a #6 x 1/2” sheet metal screw can be used at the joint, but is not required as the pipe will securely
lock when twisted (
Figure 15B
).
Where required, a telescopic vent section (SV4.5LA) may be used to provide the installer with an option to install
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 SV4.5LA Telescopic Vent Section has an effective length of
from 1-1/2 to 7” (38 to 178 mm). The SV4.5LA is fitted with a locking inclined channel end (identical to a normal
vent section component) and a plain end with three (3) pilot holes. Slip the plain end over the locking channel end of
a standard SV4.5 vent component the required distance and secure with three (3) screws.
Vent elbows
Vent elbows are available in 90° and 45° configurations. Refer to
Figure 16
for the SV4.5E45 and SV4.5E90 elbow dimensions. 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 direction of the next vent run element.
1. Rotate the elbow in a clockwise direction (to avoid the possibility of
unlocking any of the previously connected vent sections) for proper
alignment (
Figure 16
). See Connecting the vent pipe for more information.
Table 13 - Effective Vent Length
Figure 15A - Connecting
vent components
Figure 15B - Connected
vent components
Figure 16 - Elbow Dimensions
Dimple
Locking
Incline
Channel
Arrow
Appliance Collar or
Vent Section
Dimple
Locking
Incline
Channel
Arrow
Inches (millimeters)
13-5/8
(346)
15-1/2
(394)
9-7/8
(251)
Non-Swivel
Non-Swivel
10
(254)
~45°
~90°
