CFM Corporation WMC36 WMC42 Installation, WMC Series Woodburning Fireplace, Chimney Supports

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.

Chimney Sup- port Strap

Chimney

Support

FP284

Fig. 7 Chimney support installation.

WMC Series Woodburning Fireplace

Installation

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)

Cover Plate

Top Shield

Hard, Flat

Surface

Insulation

PlatformFPC555

Fig. 8 Insulating between platform and fireplace.

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