CFM Corporation WMC36 WMC42 - Manual (Page 12)

12
WMC Series Woodburning Fireplace
20000583
FP593
SR/C
11/20/97
Fig. 19 Installing firestop spacer.
FP593
Nails (4)
Firestop Spacer
Joist
Attic Installation
Ceiling Installation
Joist
Firestop Spacer
Nails (4)
FP263
Fig. 20 Attic shield installlation (Canadian requirement).
IGF263
MBUF
5/9/96
Attic Insula-
tion Shield
Ceiling
Base
Flanges
Nails
(4 required)
Attic Joist
hole and the angled portion extending down into the
hole.
Firestop spacers are not available for nor are they re-
quired on vertical walls.
DO NOT put any sealant around the area where the
outer pipe slides through the firestop spacer. If you seal
this area, it may cause a fire hazard.
Canadian Requirements for
Insulation Shield
In Canada, an attic insulation shield is required to pre-
vent attic insulation from contacting the chimney sec-
tion. Framing dimensions for the chimney hole should
measure 14¹⁄₂" x 14¹⁄₂" (368 x 368 mm) for SK8; 17¹⁄₂" x
17¹⁄₂" (445 x 445 mm) for 3-wall. An attic shield MUST
be installed on top of attic joists (above the floor level).
(Fig. 20)
NOTE: In the U.S., it is a good idea, although not al-
ways required, to install an attic insulation shield where
blown-in insulation is planned to be used in the attic.
Install the attic insulation shield with the flanges on its
base extending down into the framing hole. Nail each
corner of attic insulation shield to the framing members
of the ceiling hole using 8d nails. Attic shields are not
required at the roof.
Continue Installing Pipe to Complete Run
Continue attaching pipe sections to complete system
to next level always being careful that the pipe is firmly
snapped locked in place before proceeding to next pipe
section.
Chimney Supports
If chimney supports are required, they are installed
the same as elbows. Nail chimney support straps to
adjacent structural framing, as shown on Page 7, Figure
7. Bend straps as necessary and make sure they are
secure so they will support the weight of the chimney. A
chimney support is 2¹⁄₂" long when installed. Consider
this dimension when determining how many straight
chimney sections are needed.
NOTE: Chimney supports are generally used in long
runs in a chase installation.
Additional Ceilings
If you encounter additional ceilings, repeat same steps
required for first ceiling installation. Refer to firestop
illustration on Figure 19.
Penetrating the Roof
Run pipe to roof line. Since chimney system must be
vented to the out-of-doors, you must use an approved
termination.
If a chase is used, refer to the installation manual pro-
vided with the termination cap.
Locate Chimney Centerpoint On Roof
Use same procedure detailed in locating center point of
the flue system.
Drive a nail up through roof at the center point. This will
determine center point on outside of the roof.
Cut and Frame Roof Hole
Size of roof hole varies with the type of chimney ter-
mination installed. Refer to installation instructions
provided with the chimney termination to find correct
size of roof hole.
There must be an air space (1¹⁄₂" - SK8; 2" - 3-wall)
between outermost portion of chimney sections and any