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HOT AIR DUCTING INSTALLATION
Different hot air ducting systems can be installed
with the WRT4820WS fireplace:
- Gravity kit
- Forced air kit
Gravity Kit
The gravity kit is designed for double hot air
outlets and includes: (See Figures 20 and 21)
- 2 telescopic lengths 8" I.D.
- 2 90º elbows 8" I.D.
- 2 hot air outlet kits (grill and frames)
- 2 adaptors
See Gravity Kit Accessories on Page 24.
The only blower that can be used with the gravity
kit is the UZY6.
The gravity kit must be used with the clean face
kit to allow hot air flow that would normally
come out of the top louver. To do so, follow
the steps below:
a) Install the clean face kit making sure that
the insulation strip is installed inside.
b) The fireplace façade can be covered with
non-combustible material (Figure 22).
Frame
Grill
WARNING: Both pipes of
the double hot air outlet
must be installed. Any oth-
er installation may cause
fire and void warranty.
Figure 20
For safe installation, the gravity kit must meet
the following requirements:
Minimum height*
68" (1,727 mm)
Maximum length
See Figures 20 and 21
* The height of the louver must be measured
from the base of the WRT4820WS fireplace to
the middle point of the louver.
To extend the double outlet system forward
of the WRT4820WS fireplace (not flush), it
will be necessary to purchase two adjustable
lengths (H8951).
When installing the double outlet system, the
hot air outlets can be installed in the same room
as the fireplace, or one or both of the outlets
can be installed in adjacent or upper rooms.
Installing the ducts at different elevations will
tend to exhaust more heat out of the higher
outlet (Figure 21).
14
WARNING: The outlet grills
should not be installed fac-
ing upward through a floor.
Danger of burns can result if
grills in floor are stepped on.
13" x 13"
Outlet Grill
(330mm x 330mm)
10' (3.1m)
Max.
Maintain at least 6-1/2"
(160 mm) clearance from
the outlet grill framing to
a combustible ceiling,
side wall or mantel.
Figure 21
Collar
Flashing
NOTES:
- Seal the top and
both sides of the
roof flashing with
waterproof caulk-
ing.
- The gap between
the vent pipe and
a vertical firestop
shall be sealed
with non-combus-
tible caulking.
Figure 22
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Outlet Grill
Rain Cap
Attic Radiation
Shield
u
u
Combustibles are not allowed
below top spacers above the
fireplace. Facing in front of fire-
place must be non-combustible
below this area.
10'
(3.1m)
Max.
Roof Support
Radiation Shield (Firestop)
6-1/2" Min.
(to ceiling)
68" Min.
(1727mm)
45" Min.
(1143mm)
Non-Combustible
Facing
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