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10
STR/CVR Series Woodburning Fireplaces
7412961
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 cen-
ter 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, re-position chimney and/or fireplace
to avoid obstructions.
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.
The following table gives firestop spacer model num-
bers:
The inside dimension of the frame must be the same
as the hole size selected from Figure 12 in order to
provide the required air space (1¹/₂" (38mm)with SK8,
2" (51mm) with Model 11CF) between the outside
diameter of the chimney and the edges of the framed
ceiling hole.
FP707
STR/CVR
LOCATE CENTER LINE
6/1/98
X
STR 33: 19" (483mm)
STR36 / CVR36: 20/" 521mm)
STR42 / CVR42: 23/" (597mm)
MODEL X =
Fig. 10 Locate centerline of chimney with plumb line.
FP707
Actual Centerpoint
Chimney
Centerline
Side of
STR/CVR
Plumb Line
Plumb Bob
Imaginary
Centerpoint
Fig. 12 Typical frame for ceiling chimney hole.
FP551A
FP551A
BR/BC
9/23/98
A/B
A/B
A "SK8" Series framing = 14" X 14" (368 x 368mm)
B 11CF framing = 17" X 17" (445 x 445mm)
Existing
Ceiling
Joists
Chimney Hole
New Framing
Members
Fig. 11 Ceiling chimney hole sizes necessary for installing
firestop spacer.
Angle of Chimney at Ceiling
Size of Chimney Vertical 30°
8" Flue SKFS2A SKFS6A
"SK" Series 14
¹⁄₂" x 14¹⁄₂" 14¹⁄₂" x 25¹⁄₂"
(368mm x 368mm) (368mm x 648mm)
FS2A FS6A
11" CF 2-Wall 17
¹⁄₂" x 17¹⁄₂" 17⁷⁄₈" x 29⁵⁄₈"
(445mm x 445mm) (454mm x 753mm)