CFM Corporation WMC36 WMC42 - Manual (Page 10)

10
WMC Series Woodburning Fireplace
20000583
Framing the Ceiling Hole
Frame the ceiling chimney hole as shown in Figure 13.
It is good practice to use framing lumber that is the
same size as the ceiling joists; this is a requirement at
attic level.
The following table gives firestop spacer model num-
bers:
Safety strips are used to ensure that any combustible
materials in front of the fireplace are protected even
though a noncombustible hearth extension is required.
If fireplace is to be elevated above the floor, a “Z”
shaped metal safety strip must be fabricated and used
to protect combustible surfaces in front of the fireplace.
This “Z” shaped safety strip is not provided but must be
fabricated of metal with each horizontal leg at least 1¹⁄₂"
(38 mm) wide and equal in length to the metal strips
provided with the fireplace.
Note: Safety strips are not required over noncombus-
tible floors where all supports at the base of the fireplace
are noncombustible.
Four (4) nailing flanges are supplied with the fireplace
(found on the fireplace hearth). To level the box and
secure it firmly in place, remove the nailing flanges from
the hearth and install at the sides of the fireplace as
shown in Figure 15.
Fig. 13 Typical frame for ceiling chimney hole.
FP551
WF551
BR/BC
9/29/97
See
Fig. 12
See
Fig. 12
Existing
Ceiling
Joists
Ceiling
New Framing
Members
Chimney
Hole
Fig. 12 Ceiling chimney hole sizes necessary for installing
firestop spacer.
Size of Chimney Vertical 30°
8" Flue SKFS2A SKFS6A
"SK" Series 14¹⁄₂" x 14¹⁄₂" 14¹⁄₂" x 25¹⁄₂"
(368mm x 368mm) (368mm x 648mm)
8" Flue FS2A FS6A
"S" Series 3-Wall 17¹⁄₂" x 17¹⁄₂" 17⁷⁄₈" x 29⁵⁄₈"
(445mm x 445mm) (454mm x 753mm)
Angle of Chimney at Ceiling
The inside dimension of the frame must be the same
as the hole size selected from Figure 13 in order
to provide required air space between the outside
diameter of the chimney and the edges of the framed
ceiling hole. (1¹⁄₂" - SK8; 2" - 3 wall)
Positioning, Safety Strips,
Securing The Fireplace
Slide fireplace into position.
Lift the fireplace front slightly and slide the metal safety
strips under front bottom edge about 1¹⁄₂" (38 mm),
allowing the remainder to extend in front of firebox.
Overlap strips at least 1/2" (13 mm) to provide a posi-
tive joint. (Flat safety strips are packed with fireplace.)
(Fig. 14)
FPC557
Fig. 14 Safety strip installation.
FPC557
WMC Safety strip installation
circulatin models
1/29/99 djt
Metal Safety
Strips
(1, 2 or 3 Pieces)
¹⁄₂ " (13mm)
Min. Overlap
1¹⁄₂
"
(38mm)
"Z"
Safety
Strip
Fire-
Place
Plat-
Form Hearth Ext.
(not supplied)
FPC549
Fig. 15 Fasten fireplace in position.
FPC549
Nail flange/standoff
circulating models
1/29/99 djt
Nail Top
Standoffs
Nail Side-
Nailing
Flanges