CFM Corporation WMC36 WMC42 - Manual (Page 7)

7
WMC Series Woodburning Fireplace
20000583
Chimney Supports
The chimney system is supported by the fireplace for
vertical chimney heights less than 30' (9 m) above the
hearth. Chimney supports are required if the vertical
height exceeds 30' (9 m) with SK8 chimneys or 20' (6
m) with 3-wall chimneys. Locate chimney supports
at ceiling holes or other structural framing at 30' (9 m)
(SK8) or 20' (6 m) (3-wall) heights. Spacing between
chimney supports must not exceed 30' (9 m) (SK8)
or 20' (6 m) (3-wall). Use Chimney Support Model
SKCS8 (SK8) and TCS8A (3-wall). (NOTE: The
chimney support cannot be mounted directly to
the fireplace.) Support provided by elbow straps ful-
fills the support requirement only if they are spaced as
previously described. (A chimney support is 2¹⁄₂" long
when installed.)
Angled chimney runs require a support every 6' (1.8m)
in addition to the elbow straps. Chimney supports are
used for this function. (Fig. 7)
Chase Installation
A chase is a vertical boxlike structure which encloses
the fireplace and/or chimney. Chases are typically built
on the outside of the house with fireplace opening cut
into the outer wall of a room. (Page 5, Fig. 3)
If you need help in determining fireplace location or
how the chimney system should be run, contact your
CFM Corporation dealer for assistance.
Insulating Fireplace Enclosure
for Cold Climates
If you live in a cold climate, it is not required but
highly recommended that you insulate fireplace
enclosure to eliminate cold air penetration as much
as possible.
Insulate base of fireplace with a noncombustible
insulation rated for a minimum of 300°F. Insulating
is very important for outside wall installations over
a concrete slab. If fireplace is installed on a platform,
insulation should be placed on top of the platform
before fireplace is set. (Fig. 8)
When a fireplace is installed in a chase or on a
outside wall, enclosure should be treated like any
outside wall in a home. Insulation should be installed
on the inside wall as well as the outside wall(s). In a
chase, it is also a good idea to install a firestop at the
first ceiling level above the fireplace and enclose the
chase with sheeting material. Insulation may then be
installed above sheeting material to assure the space
around the fireplace is totally protected. (Fig. 3)
When installing the chimney, DO NOT caulk between
outer pipe and firestop. It is vital that some air be al-
lowed to flow through this very thin gap.
CAUTION: WHEN INSTALLING A FIREPLACE IN
AN INSULATED ENCLOSURE, BE SURE ALL RE-
QUIRED AIR SPACES ARE MAINTAINED. (Page 13,
Fig. 18)
Installation
FP284
Fig. 7 Chimney support installation.
FP284
MBUF CHIMNEY SUPPORT
1/28/99 djt
Chimney Sup-
port Strap
Chimney
Support
FPC555
Platform insulation
circulating model
1/28/99 djt
FPC555
Fig. 8 Insulating between platform and fireplace.
Cover Plate
Top Shield
Hard, Flat
Surface
Insulation
Platform