Installation
900960-00C, 06/2019
Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
32
8. Change vent direction—At transition from or to a horizontal/inclined run, install SV4.5E45 or SV4.5E90 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 direction 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 (
Figure 16, Page 23
).
9. Continue installation of horizontal/inclined sections—Continue with the installation of the straight vent sections in horizontal/
inclined run. Install support straps every 5 ft. (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape in a
direction away from the fireplace (
Figure 24, Page 31
). Maintain the horizontal/inclined run in a straight (no dips), slightly elevated
plane. The recommended incline is approximately 1/4” per 1 ft (20 mm per 1 m) horizontal, in a direction away from the fireplace.
Smaller rise per foot run ratios are acceptable all the way to at or near level. Use a carpenter’s level to measure from a constant
surface and adjust the support straps as necessary. Maintain the required clearances to combustibles (
Page 26
).
10. Assemble the vent run to the exterior wall—If not previously measured, locate the center of the vent at the exterior wall. Prepare
the opening. Assemble the vent system until the terminus of the last section is within 7” (178 mm) to 11-1/4” (286 mm) inboard of
the exterior surface to which the SV4.5HT termination is to be attached (
Figure 25B, Page 33
). If the terminus of the last section
is not within this distance, use the telescopic vent section SV4.5LA, as the last vent section.
Table 20
lists the additional venting
components needed (in addition to the termination and adaptor) for a range of wall thicknesses.
11. Attach the termination adaptor—Attach the adaptor (SV4.5RCH, provided with the termination) to the vent section or telescoping
vent section, elbow or fireplace collar (
Figure 25B
).
12. Install the firestop/spacer at the exterior wall—When using the square termination, install SV4.5HF (Secure Vent
®
), SF4.5HF
(Secure Flex
®
) Firestop/Spacer over the opening at the exterior side of the framing, long side up, with the 3” spacer clearance at the
top (
Figure 25B
) and nail into place. If the SV4.5HTSS termination is used (35” models only); This Wall Heatshield shall be installed,
using the provided burn screws on the firestop to maintain 1-1/4” clearance to flue pipe (see
Figure 25A
). The Wall Heatshield shall
extend to protect all combustible material directly over the pipe. For walls thicker than 12”, order a Wall Heatshield extension kit (cat.
no. F3694), that attaches to this heatshield (see
Figure 25A
).
NOTE:
The firestop/spacer may also be installed over the opening at the interior side of the framing.
Figure 25A - Install Wall Heatshield (if SV4.5HTSS termination is used - for 35” models only)
The horizontal terminations have been designed to perform in a wide range of weather conditions. Our terminations meet or exceed
industry standards.
When selecting the locations of your horizontal terminations, do not place the termination where water from eaves and adjoining
rooflines may create a heavy flow of cascading water onto the termination cap. If the cap must be placed where the possibility of
cascading water exists, it is the responsibility of the builder to direct the water away from the termination cap by using gutters or other
means.
Take care to carefully follow the installation instructions for the termination, including the use of silicone caulking where required.
13. Install the termination—From outside the exterior wall, slide the collars of the termination onto the adaptor (the outer over the outer
and the inner inside the inner) until the termination seats against the exterior wall surface to which it will be attached. Orient the
housing of the termination with the arrow pointed upwards. Secure the termination to the exterior wall. The horizontal termination
must not be recessed into the exterior wall or siding by more than the 1-1/4” (32 mm) (
Figure 26
).
NOTE:
If the venting exits the building below grade, or close to grade, see Installation Accessories on
Page 49
for available snorkel
terminations. The termination must be above grade and above the expected level of snow accumulation.
NOTE:
The vent termination is hot while in operation and for a period of time following the use of the fireplace. To prevent contact
with hot surfaces, use a horizontal termination guard; available for purchase at your local dealer.
WALL Heatshield EXTENSION
for wall thicknesses greater than
12” (order cat. no. F3694)
Wall Heatshield
(provided with 35” models)
35” MODELS ONLY
Bend wall Heatshield
as shown here
