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Framing
Stud
Figure 16
Note: The nailing tabs and the area directly
behind the nailing tabs are exempt from the
clearances described on page 5. Maintain at
least 1/2" clearance from the firebox wrapper to
the framing at the closest point of contact,
directly adjacent to the flange.
Installing The Combustion Air Kit
Step 5. Remove one of the knockouts from the
side of the fireplace. Attach the 6" (152 mm)
collar from the FOAK-6W chimney air kit to the
transition, using the four (4) No. 8 x ¹⁄₂" screws
provided ( Figure 17 ).
Figure 17
Step 6. Connect the 6" (152 mm) Class 0 or
Class 1 air duct to the collar (just mounted)
with the tie strip provided in the hardware kit.
Step 7. Route the Class 0 or Class 1 air duct
out the back or side wall, up through the ceiling
or floor joists to an outside wall. The air duct
should be located above snow level.
8
Note: If the fireplace is installed against an
inside wall, the Class 0 or Class 1 air duct may
be extended into a ventilated attic space at
least 18" (457 mm) above the attic floor. Se-
cure the duct hood to a vertical post with the
Nailing Flange
inlet positioned downward. Ensure nothing
blocks the hood opening. Do not terminate the
duct hood higher than the chimney.
Step 8. Cut or frame a hole through the outside
wall for the installation of the duct inlet hood.
Screw, 8d
A 6 ¹⁄₂" (151 mm) diameter hole is sufficient.
Nail Or
Feed the loose end of the flexible air duct
Equivalent
Fastener
through the hole cut for the inlet hood and
attach to collar on inlet hood using the tie strip
provided. Insert hood into opening. Secure in
place with the No. 8 x 1 ¹⁄₂" screws provided or
with nails driven through holes in hood flange.
Seal with noncombustible waterproof silicon
type caulking. If additional air duct is needed,
use a Class 0 or Class 1 duct.
INSTALLING THE CHIMNEY SYSTEM
Step 1. Before continuing, check the operation
of the damper, as described on page 4, ( refer to
Figure 2 ).
Step 2. Using standard construction framing
techniques, construct opening for chimney route
up through the ceiling(s) and roof or through an
outside chase.
Framing must maintain adequate minimum air
space clearance at all times.
CAUTION: ALLOW MINIMUM 2" CHIMNEY
AIR SPACE TO COMBUSTIBLE FRAMING MEM-
BERS THROUGHOUT VERTICAL OR OFFSET
CHIMNEY INSTALLATION.
Combustion
A minimum 2" air space must be reserved for
Air Kit
all combustible materials extending for any
continuous length surrounding the chimney.
Reference Figures 14 and 15 and charts Fram-
ing Dimensions for Ceiling and Roof, which
specify minimum ceiling and roof dimensions.
In new construction, to determine chimney cen-
ter line, use plumb line from roof or ceiling above
fireplace to center of flue collar on fireplace.
For remodeling, plumb to center of flue collar
from ceiling above, drive nail through ceiling
from below to mark position, then mark and
cut to passage from above ceiling (around
nail) ( Figure 18 ). Then plumb from ceiling or
roof level directly above hole which has just
been completed.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Figure 18
Step 3. Position appropriate thimble/firestop
spacer at ceiling and nail temporarily with two
(2) 8d nails or equivalent fasteners ( refer to
Figures 20, 21 and 22 ). Use one fastener on
opposite sides to hold thimble/firestop spacer
in position. Nail permanently, using at least
two (2) more fasteners, after chimney sec-
tions have been assembled through the
thimble/firestop spacer and after any neces-
sary adjustments have been made. The firestop
spacer must be secured by at least four (4)
fasteners when completely installed.
Note: If there is a room above ceiling level,
firestop spacer must be installed on the bot-
tom side of the ceiling. If an attic is above
ceiling level, firestop thimble must be installed
on bottom side of ceiling joist (Figures 19 and
20 ). Do not use adjustable thimble/firestop
between floors.
Room Above
Figure 19
Attic Above
Firestop Thimble
Figure 20
Plumb Line
Firestop Spacer
2"
Clearance
Minimum
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