Vermont Casting CR36L - Manual (Page 9)

9
CR Series Woodburning Fireplaces
20001316
Ceiling Chimney Hole/
Possible Obstructions
The size of the hole in the 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. wir-
ing, 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 10.
It is good practice to use framing lumber that is the
same size as the ceiling joists; this is a requirement at
attic level.
Positioning, Safety Strips,
Securing the Fireplace
Slide fireplace into position.
Lift the fireplace front slightly and slide the metal safety
strips under front bottom edge about 1¹⁄₂” (38mm),
allowing the remainder to extend in front of firebox.
Overlap strips at least 1/2” (13mm) to provide a posi-
tive joint. (Flat safety strips are packed with fireplace.)
(Fig. 11)
Safety strips are used to ensure that any combustible
materials in front of the fireplace are protected even
though a noncombustible hearth extension is required.
If fireplace is to be elevated above the floor, a “Z”
shaped metal safety strip must be fabricated and used
to protect combustible surfaces in front of the fireplace.
This “Z” shaped safety strip is not provided but must
be fabricated of metal with each horizontal leg at least
1¹⁄₂” (38mm) wide and equal in length to the metal
strips provided with the fireplace.
NOTE: Safety strips are not required over noncom-
bustible floors where all supports at the base of the
fireplace are noncombustible.
Outside Air Kit
An outside air kit damper is installed in all CR36L/R
Series Fireplaces. If desired, or if local codes mandate
the use of an air kit, then an AK-MST is required to
complete the installation (from air kit to the outdoors).
If the outside air kit is to be used, the AK-MST Air Ter-
mination Kit MUST be installed BEFORE the fireplace
is enclosed. Refer to the AK-MST instructions for field
installation. NOTE: Outside air control knob can be
found in screen bag.
The inside dimension of the frame must be the
same as the hole size selected from Figure 10 in order
to provide the required 1¹⁄₂” air space between the
outside diameter of the chimney and the edges of the
framed ceiling hole.
Fig. 9 Ceiling chimney hole sizes necessary for installing
firestop spacer.
Size of Angle of chimney at ceiling
Chimney Vertical 30°
8” Flue 14¹⁄₂ x 14¹⁄₂ 14¹⁄₂ x 25¹⁄₂
(368 x 368mm) (368 x 648mm)
Fig. 10 Typical frame for ceiling chimney hole
FP551a
CR36 Series
2/22/99 djt
14¹⁄₂"
(368mm)
14¹⁄₂"
(368mm)
Existing
Ceiling
Joists
Ceiling
New Framing
Members
Chimney Hole
FP551A
Fig. 11 Safety strip installation.
FPR557
CR36R,L
Safety strip installation
2/3/99 djt
Metal Safety
Strips
(1, 2 or 3 pieces)
¹⁄₂ " (13mm)
Min. Overlap
1¹⁄₂ "
(38mm)
"Z"
Safety
Strip
Fire-
place
Plat-
form Hearth Ext.
(not supplied)
1¹⁄₂ "
(38mm)
FPR557