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The duct system must be installed respecting
the following:
1. Remove the top and bottom plates closing up
the 8" diameter holes on top of the fi replace.
Then, cut the insulation in order to obtain two
8" diameter openings. Fix the adaptors on
the fi replace openings by turning clockwise
(refer to Figures 16 and 17).
2. Maintain at least a 2" (50mm) clearance
between the ducts and any combustible
material; the required hole size is 13" x 13"
(330 mm x 330 mm).
Exception: For the grills, the framing 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 or mantel.
5. When traversing a combustible wall or fl oor,
a fi restop must be installed at the wall or
fl oor 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 fan will cause the furnace duct to
overheat. A furnace duct is only single wall
and not double wall as is required for the
WRT4826WH fi replace 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 fi replace or ceiling.
8. Do not use insulated fl exible ducts as they
will overheat.
16
Collar
Flashing
Attic radiation
Shield
Combustibles are not allowed on the black portion of the fi replace. Drywall can be installed
below the top spacer up to the fi replace.
Figure 18
9. Do not use tees or any other components
than the ones specifi cally listed here.
10. All ducts must extend upwards or hori-
zontally. Never try to route the ducting
downwards.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Rain cap
Roof support
Firestop
*54"Min.
Non-combustible
facing
*48" When clean face panel
(BPCF) is installed (as shown)
11. The hot air outlet grills must be installed with
the louvers pointing downwards in order to
prevent overheating adjacent ceilings.
12. Do not install outlet grills facing upward in
a fl oor. They will get hot and create a risk
of burns if stepped on.
68" Min.
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