Majestic Fireplaces® BR/BC Series
Straight-Up Chimney Installation
To mark the centerline of the flue, put the fireplace in final position and measure out from the wall: 8¹⁄₄" (210 mm)
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)
Chimney Centerline
Actual Centerpoint
����" (210mm)
Plumb Line
Plumb Bob
Imaginary
Centerpoint
FP556
Fig. 11 Locate centerline of chimney with plumb line.
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 that the elbow straps can be secured to framing members to help support the weight of the chimney.
10
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,
Cutting the Hole
Cover fireplace collar opening and cut proper sized chimney hole in chimney. The SK8 pipe allows you to run pipe through a typical 16” on center joist without cutting joists.
Framing the Ceiling Hole
Frame the ceiling chimney hole as shown in Figure
12.It is good practice to use framing lumber that is the same size as the ceiling joists; this is a requirement at attic level.
Existing Ceiling | AB | AB |
Joists |
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| Chimney |
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| Hole |
Ceiling |
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New Framing |
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Members |
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A "SK" Series framing = 14¹⁄₂" X 14¹⁄₂" (368 x 368mm) | ||
B "S" Series framing = 17¹⁄₂" X 17¹⁄₂" (445 x 445mm) | ||
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| FP551 |
Fig. 12 Typical frame for ceiling chimney hole. | ||
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| 7412944 |
