Heatilator • LM42 • Installers Manual • 4087-901 • Rev A • 04/14/16
5
2
Getting Started
A. Typical Fireplace System
Figure 2.1 Typical Fireplace System
Section 2
Termination Cap
Additional lateral
support for chimney
above roof (or enclosed
in chase) if needed
Chimney penetrates roof
preferably without affecting
roof rafters
Storm Collar
Non-combustible
roof flashing maintains
minimum clearance
around chimney
Offset/Return
(with hanger straps)
Support straps
on rafter supports
chimney (not shown)
Attic insulation shield
must be used to keep
insulation away
from chimney if
attic is insulated
Ceiling firestop
on floor of attic
Framing headed
off in ceiling joists
Outside
combustion air
Mantel
Chimney system
Enclosed space above
and around fireplace
Combustible
framing/header
on top of V-shaped
standoffs (spacers)
Chimney Air Kit (CAK-4A) (not
shown) must be used with SL300
chimney in Canada.
Non-combustible material
Outside
combustion air
Hearth Extension
Locate cooling air in the enclosure of
outdoor unit no less than 12 inches
off ground level.