Lennox Hearth CAMBRIA 850 - Manual (Page 14)

Figure 23
Figure 21
HOT AIR DUCTING INSTALLATION
(OPTIONAL)
Different hot air ducting systems can be installed
with the Cambria™ fireplace:
• Gravity kit
• Forced air kit
The gravity kit is used when the rooms are on
same level or floor as the fireplace or on an up-
per level or floor. If the heat to be distributed
is on a lower level or floor, then the forced
air kit MUST be used.
Gravity Kit
Double hot air outlet including:
(See Figure 21)
• 2 ea. telescopic lengths, 8” I.D.
• 2 ea. 90º elbows, 8” I.D.
• 2 ea. hot air outlet kits (grill and frames)
• 2 ea. adaptors
See components list on Page 23.
Only the blower available with the fireplace can
be used with the gravity kit.
Grill
Frame
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 22).
The safety rules for hot air ducting gravity kit
installations are the following:
Minimum height* 68” (1727 mm)
Maximum length - See Figure 22
* The height of the louver must be measured
from the base of the Cambria fireplace to
the middle point of the louver.
WARNING: Both pipe of the double hot air
outlet must be installed. Any other installa-
tion can cause greater risk of fire and void
the warranty.
Figure 22
13” x 13”
10’ Max.
WARNING: The outlet grills
should not be installed
facing upward through a
floor. Danger of burns can
result if grills in floor are
stepped on.
Outlet Grill
10’ Max.
Maintain at least 6-1/2”
(160 mm) clearance from
the outlet grill framing to
a combustible ceiling,
side wall or mantel.
Flashing
Collar
Flashing
Attic
Radiation
Shield
Rain Cap
Roof Support
Firestop
68” Min.
(1727 mm)
59” Min.
(1499mm)
Non-Combustible
Flameproof
Facing
u
u Combustibles are not allowed below top spacers
above the fireplace. Facing in front of fireplace
must be non-combustible below this area.
WARNING: Both pipes of
the double hot air outlet
must be installed. Any oth-
er installation may cause
fire and void warranty.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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