Lennox BRENTWOOD SP Installation And Operation Instructions Manual page 9

Insulated Chase Construction
Attic Radiation
Shield
Note: Floor and wall below the attic must be
insulated using the same insulation.
Firestop
1/2" Plywood
Figure 8
Facing
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) (Figure 9).
2. Non-combustible materials such as brick,
stone or ceramic tile may project in front of
and onto the fireplace facing (Figure 10).
Mantel
The mantel must be installed at least 45"
(1143 mm) above the base of the fireplace
(Figure 9).
Roof Support
7 Feet Min.
Mantel
45"
Figure 9
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Insulate Joists
Storm Collar
Same As Ceiling
Flashing
Floor
Ceiling
Wall
Draft Stops
Firestop
• Must have the same firestopping resistance
CTDT
as adjacent wall. Termination
• Must have the same insulation as adjacent
ceiling.
• Follow local rules regarding framing Note: Non-
Combustible
construction.
Chase
Flashing
Must Be
Used To
Cover
Chase
Opening
Drywall
Insulation
(Thermal Barrier)
2" x 4"
1/2" Drywall
2" X 3" Min.
Spacer
Optional
Insulation
In Outside
Walls Of
Chase
8'
Level
Solid
Continuous
Surface
Outside
Base
Non-Combustible Facing
1/2" Drywall
2" X 3" Min.
Spacer
Door
Figure 10
9