CFM Corporation WMC36 WMC42 manual WMC Series Woodburning Fireplace, Chimney Supports, 20000583

WMC Series Woodburning Fireplace

Attic Installation

Nails (4)

Firestop Spacer

Joist

Ceiling Installation

Joist

Firestop Spacer

Nails (4) FP593

Fig. 19 Installing firestop spacer.

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.

Attic Insula- tion Shield

Nails

(4 required)

Attic Joist

Base

Ceiling Flanges

FP263

Fig. 20 Attic shield installlation (Canadian requirement).

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

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