Vermont Castings BR36 Homeowner's Installation And Operating Manual page 10

BR/BC Series Woodburning Fireplaces
Straight-Up Chimney Installation
To mark the centerline of the flue, put the fireplace in final
position and measure out from the wall: 8Z⁄v"
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
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 us-
ing Vermont Castings Group 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
(210
"
(210mm)
Plumb Line
Plumb Bob
Imaginary
Centerpoint
FP556
FP556
BR/BC
LOCATE CENTER LINE
11/10/97
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. Measure
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 pos-
sible obstructions are located...i.e. wiring, plumbing etc...
If necessary, re-position chimney and/or fireplace to avoid
obstructions.
Cutting the Hole
Cover fireplace collar opening and cut proper sized chim-
ney 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.
The following table gives firestop spacer model num-
bers:
AB
Existing Ceiling
Joists
Ceiling
New Framing
Members
A "SK" Series framing = 14Z⁄₂" X 14Z⁄₂" (368 x 368mm)
B "S" Series framing = 17 Z⁄₂" X 17 Z⁄₂" (445 x 445mm)
Fig. 12 Typical frame for ceiling chimney hole.
AB
Chimney Hole
FP551
FP551
BR/BC
9/29/97
7412944