Monessen Hearth M400BFC Installing Chimney System, Installing the Firestop Spacer Ceiling Hole

M400BFC Balanced Flue Heat-Circulating Fireplace

Installing the

Chimney System

Start by attaching the first chimney section to the collar on top of the fireplace.

Install the pipe as pictured in Figure 14. When you get a good lock, you will hear the pipe clearly snap together. Once sections are snap-locked in place, it is extremely difficult to get them apart. Make sure the pipe is firmly snapped and locked together as each pipe section is mounted.

When installing elbows, only outer pipe will snap- lock. Middle pipes simply slide into position. Be sure to always attach straps on upper elbow to a structural framing member. (Fig. 15)

Continue installing the pipe as required until pipe is installed up through the ceiling. At this point, you must install a firestop spacer.

Pipe Section

Pipe

Rim

Hem

Lance

Pipe

Hem

FPC558a

Fig. 14 Install pipe, listening for the snap-lock to fasten.

Installing the Firestop Spacer

in the Ceiling Hole

A firestop spacer is used to keep pipe spaced properly and required for safety.

Nail the firestop spacer (at each corner) to the framing members of the ceiling hole. Note: A firestop spacer is not required at the roof.

Hole sizes listed in Figure 11 for angled firestop spac- ers provide minimum required air space to chimney pipe for ceiling thickness up to 8” (203 mm). When combined thickness of ceiling material, ceiling joists and flooring material exceeds 8” (203 mm), adjustments must be made in framing to assure that minimum air spaces to chimney are maintained.

Proper Firestop Spacer Installation

Elbow Strap

Angled Strap

FP270/271

Support Structure

Elbow Strap (must be tight)

Ceiling Hole Fram- ing

Angled Firestop

Chimney Support Strap (must be tight)

Figure 16 shows different installation procedures for both an area that is an attic and an area that is not an attic.

Fig. 15 Attach straps to a structural framing member.

If the area above the ceil- ing is not an attic, position the firestop spacer with the flange on the ceiling side and the angled portion ex- tending up into the hole.

If the area above the ceil- ing is an attic, position the firestop spacer with the flange on the top of the framed hole and the angled portion extending down into the hole.

Attic Installation	Ceiling Installation
Nails (4)
	Joist
Firestop
Spacer
	Firestop
Joist	Spacer
NOTE: If the attic insulation shield is used, the	Nails (4)
firestop is not required in the attic installation.	FP593
Fig. 16 Installing firestop spacer.

12 87D1505