CFM Corporation SHR48 Straight-Up Chimney Installation, Offset Installation, Cutting the Hole

Models: SHR48

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Straight-Up Chimney Installation

SHR Series Woodburning Fireplace

CAUTION: REPORT TO YOUR DEALER ANY PARTS DAMAGED IN SHIPMENT, SPECIFICALLY CHECK THE END CONNECTION OF CHIMNEY SECTIONS AND ELBOWS.

NOTE: SHR Series Fireplaces must use CFM Corpora- tion model 11CF, 11 inch, 2 wall chimney systems. The installation procedure described in this manual applies only to the 11CF system, chimney components may not be mixed.

Straight-Up Chimney Installation

To mark the centerline of the flue, put the fireplace in final position and measure out from the wall 11¹⁄₈". Mark a spot on the ceiling directly above the fireplace. Draw a line parallel to the back wall through this mark. (Fig. 13)

Using a plumb bob positioned directly over center point of fireplace flue collar, mark the ceiling to establish the chimney center point. (Fig. 13)

Offset Installation

In order to clear an obstruction, it may be necessary to offset chimney from vertical. This is accomplished by using CFM Corporation elbows. Use the 30˚ Offset Elbow table on Page 6 to determine proper offset and parts required.

Each offset requires two (2) elbows. The second elbow is equipped with support straps. It is very important to install the second elbow in each offset as close to the ceiling or support as possible so the elbow straps can be secured to framing members to help support the weight of the chimney.

Determine offset distance of your chimney arrangement from centerline of fireplace to centerline of chimney where it is to pass through ceiling.

Locate center point of the chimney on ceiling as though a straight up chimney arrangement is to be used. Mea- sure your offset dimension from straight up chimney center point on ceiling.

Ceiling Chimney Hole/

Possible Obstructions

The size of the hole in ceiling will vary with the angle at which the chimney passes through ceiling.

Drive a nail up through ceiling at marked chimney center point. Go to floor above and see where hole will be cut. Check to see where existing ceiling joists and other possible obstructions are located...i.e. wiring, plumbing etc... If necessary, reposition chimney and/or fireplace to avoid obstructions.

 

Chimney Centerline

 

Actual Centerpoint

 

11¹⁄₈"

 

(283 mm)

 

Plumb Line

 

Plumb Bob

 

Imaginary

 

Centerpoint

FP556SHR

Fig. 13

Locate centerline of chimney with plumb line.

Cutting the Hole

Cover fireplace collar opening and cut proper sized chimney hole in chimney. (Fig. 14 & 15)

Framing the Ceiling Hole

Frame the ceiling chimney hole as shown in Figure

15.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:

CHIMNEY HOLE SIZE

Size of Chimney

Angle of Chimney at Ceiling

Vertical

30˚

11" CF 2-Wall

FS2A

FS6A

17���" x 17���"

17���" x 29���"

 

(445 x 445 mm)

(454 x 753 mm)

Fig. 14 Ceiling chimney hole size necessary for installing firestop spacer.

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CFM Corporation SHR48 Straight-Up Chimney Installation, Offset Installation, Ceiling Chimney Hole Possible Obstructions