Lennox Hearth CAMBRIA 850 - Manual (Page 12)

Nailing Flanges
Four nailing flanges are provided to secure the
fireplace to the floor (see figure below). Bend
the nailing flanges down so that each flange is
flush with the floor, then using nails or screws,
secure the fireplace to the floor (2 places each
side). The heads of the screws or nails must
be large enough to completely cover the holes
in the nailing flanges.
Nailing Flange
(2 places each side)
Unbend to floor
and nail/screw
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
12
Figure 16
Insulated Chase Construction
Floor
Ceiling
Wall
• Must have the same firestopping
resistance as adjacent wall.
• Must have the same insulation as
adjacent ceiling.
• Follow local rules regarding framing
construction.
Attic Radiation
Shield
Roof Support
Storm Collar
Flashing
Drywall or Any Rigid
Material
2” x 4”
FIREPLACE
1/2” Plywood
Firestop
Insulate Joists
Same As Ceiling
Draft Stops
Firestop
CTDT
Termination
Note: Non-
Combustible
Chase
Flashing
Must Be
Used To
Cover
Chase
Opening
8'
Level
7’ 10”
(2.4 m)
Min.
7’ 6”
(2.3 m)
Min.
8’
(2.4 m)
Level
Outside
Base
Insulation
(Thermal Barrier)
Solid
Continuous
Surface
NOTE: It is recommended that the chase walls
and floor be insulated in the same manner,
using the same insulation, as the rest of the
building, below the attic.
SEE NOTE
Fireplace
Side
1. Combustible material must be installed flush
with the fireplace. It may not project in front
of and on the fireplace (i.e. the steel facade
of the fireplace) (see Figure 19).
2. Non-combustible materials such as brick,
stone or ceramic tile may project in front
of and onto the fireplace facing (see Figure
20).
IMPORTANT
The facade must be removable
once installed. The facade is
designed to overlap any facing
material installed on the front of
the fireplace. If thicker material
is installed, use the facade as a
template and make sure it can be
easily removed for servicing.
FACING
1
3
4
5
6
2
1
2
7
3
4
1. Fireplace
2. Front of fireplace
3. Wood frame (2” x 3” min)
4. Drywall
5. Tiles
6. Rock board or other
7. Brick
Fireplace Frame Section
(Top View)
Figure 17
MANTEL AND FACING
The mantel must be installed at least 59”
(1500 mm) above the base of the fireplace
(see Figure 18).