Figure 16
Rain Cap
Flashing Collar
Flashing
Firestop
68” Min.
(1727mm)
39” Min.
(990mm)
Non-Combustible
Facing
Roof Support
Attic Radiation Shield
The duct system must be installed respecting
the following:
1. Remove the plates closing up the 8” dia.
holes on top of the fireplace. Then, cut
the insulation in order to obtain two 8” dia.
openings. Fix the adaptors on the fireplace
openings by turning clockwise (
Figures 14
and 15
)
.
2. Maintain at least a 2” (50 mm) clearance
between the ducts and any combustible
material; the required hole size is 13” x 13”
(330 mm x 330 mm).
Exception #1: For the grills, the fram-
ing can be 10-3/4” x 10-3/4” (275 mm
x 275 mm) to provide the clearance as
required by the integral spacers on the
double outlet duct system.
3. The maximum number of elbows in a run of
duct is two.
4. Maintain at least 6-1/2” (160 mm) clearance
from the outlet grill framing to a combustible
ceiling, side wall, mantel or floor.
5. When traversing a combustible wall or floor,
a firestop must be installed at the wall or floor
penetration. The hole size must be 13” x 13”
(330 mm x 330 mm)
6. Do not connect the hot air ducts to a central
heating system. Malfunction of the heating
system’s blower will cause the fireplace to
overheat. A furnace duct is only single wall
and not double wall as is required for the
WRT3820WS fireplace hot air exhaust.
7. Use only IHP grills and components as
described in this manual. Other grills or
registers, for example, may be too restrictive
and may overheat the fireplace or ceiling.
8. Do not use insulated flexible ducts as they
will overheat.
9. Do not use tees or any other components
than the ones specifically listed here.
10. Never allow the ducting to pitch down as
hot air will be trapped creating a fire hazard.
Never route the ducting downwards.
11. The hot air outlet grills must be installed with
the louvers pointing downwards in order to
prevent overheating adjacent ceilings.
6-1/2” Min.
(165mm) to ceiling
u
Combustibles are not allowed below top spacers
above the fireplace. Facing in front of fireplace must
be non-combustible below this area.
u
12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Central Forced Air Kit
NOTE: Not tested under EPA certification. If
installed, this appliance no longer qualifies
for EPA certification.
The knock-outs provided on the back and on
the sides of the WRT3820WS fireplace allow
the connection of insulated flexible pipe which
enables you to heat adjacent rooms up to 50
feet from the fireplace hot air outlet.
The ducting system must be installed as de-
scribed below:
A) Remove knock-out plate and cut insulation
the adaptor at the back and/or the side of the
fireplace. Fix the adaptor by twist-locking it
to the fireplace. You can use more than one
outlet on the fireplace
(see
Figure 17
).
B) Attach the 5” flexible pipe, using the collars
provided.
Important: Make sure that the
plastic wrapping around the flexible pipe
will not be in contact with the fireplace.
C) Route the flexible pipe to the chosen location.
The ducting system can be installed either
in an upper room or in a lower room.
D) Attach the flexible pipe to the blower, using
the collars
(
Figure 18
)
.
E) Fix the back draft damper to the blower
outlet.
F) Attach a flexible pipe to the fan / flexible pipe
adapter (square to round) and stretch it up
to the location where the heat is required.
G) At that point, the flexible pipe can be attached
to any air distribution grill.
H) Install the blower heating and cooling ther-
mostat (HCTW) in that part of the house to
be heated by the hot air duct. The thermostat
can be switched to a cooling thermostat and
installed in the same room as the unit. This
thermostat will turn on the blower when the
room where the fireplace is located becomes
too hot.
This option requires electricity. Make sure that
the connections to the blower have been made
according to the local codes and comply with
their requirements (see instruction provided
with the thermostat). For more information
regarding central forced and ducting, refer
to the BISFWK-1 installation sheet provided
with the kit.
