Ceiling Chimney Hole Possible Obstructions

STR/CVR Series Woodburning Fireplaces

Actual Centerpoint
Chimney	X
Centerline	X

Side of

STR/CVR

Plumb Line

Plumb Bob

Imaginary

Centerpoint


MODEL		X =
STR 33:		19" (483mm)
STR36	/ CVR36: 20�/�" 521mm)
STR42	/ CVR42: 23�/�" (597mm)

FP707

Fig. 10 Locate centerline of chimney with plumb line.

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:

	Angle of Chimney at Ceiling

Size of Chimney	Vertical	30°
8" Flue	SKFS2A	SKFS6A
"SK" Series	14¹⁄₂" x 14¹⁄₂"	14¹⁄₂" x 25¹⁄₂"
	(368mm x 368mm)	(368mm x 648mm)
	FS2A	FS6A
11" CF 2-Wall	17¹⁄₂" x 17¹⁄₂"	17⁷⁄₈" x 29⁵⁄₈"
	(445mm x 445mm)	(454mm x 753mm)

Fig. 11 Ceiling chimney hole sizes necessary for installing ﬁrestop spacer.

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.