Framing
Framing can be constructed before or after the fireplace is set in place, however, most installers build the frame before setting the fireplace.
Frame fireplace with 2 x 4 lumber or heavier materials. Refer to framing dimensions in Figures 1, 2 or 3 for basic fireplace specifications.
NOTE: Framing should be positioned to accommodate wall covering and fireplace facing material.
Chimney Set-Up
Since you have already preplanned the chimney run, you should know exactly how the installation is to be accomplished — how much pipe is required, the num- ber of elbows, if any, and type of termination to be used.
CAUTION: REPORT TO YOUR DEALER ANY PARTS DAMAGED IN SHIPMENT, SPECIFICALLY CHECK THE END CONNECTION OF CHIMNEY SECTIONS AND ELBOWS.
NOTE: ODSHR Series Fireplaces must use CFM Cor- poration 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" (283mm). Mark a spot on the ceiling directly above the fireplace. Draw a line parallel to the back wall through this mark. (Fig. 11)
Using a plumb bob positioned directly over center point of fireplace flue collar, mark the ceiling to establish the chimney center point. (Fig. 11)
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.
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ODSHR Outdoor Woodburning Fireplace
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,
| Chimney Centerline |
| Actual Centerpoint |
| 11¹⁄₈" |
| (283mm) |
| Plumb Line |
| Plumb Bob |
| Imaginary |
| Centerpoint |
FP556SHR | |
Fig. 11 | Locate centerline of chimney with plumb line. |
| 9 |