TOA Electronics CST-38 - Manual (Page 10)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 10
A minimum 2" (51 mm) air space must be
reserved for all combustible materials extend-
ing for any continuous length surrounding the
chimney.
Reference Figures 24 and 25 and charts “Fram-
ing Dimensions for Ceiling and Roof” on page
8, which specify minimum ceiling and roof
dimensions.
For new construction, to determine chimney
center 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 28 ). Then plumb from ceiling or
roof level directly above hole which has just
been completed.
Step 4. The fireplace should be secured to side
framing members using nailing tabs. Use 8d
nails (
Figure 26 ).
Figure 26
Note: The nailing tabs are exempt from the
fireplace clearances described on the fireplace
clearance label.
For Canadian Installations Proceed with
Steps 5–8.
Note: W.H.I. listed only for installation in Canada.
Step 5. Remove one of the knockouts from
either the left or right side of the fireplace
transition. Attach the 4" (102 mm) collar from
the FOAK-4 chimney air kit to the transition,
using the four (4) No. 8 x
¹⁄₂" screws provided
( Figure 27 ).
Step 6. Connect the 4" (102 mm) Class 0 or
Class 1 air duct to the collar (just mounted) with
two (2) No. 6 x
³⁄₈" screws 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.
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. Secure the
duct hood to a vertical post with the 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. A
4
¹⁄₂" (114 mm) diameter hole is sufficient. Feed
the loose end of the flexible air duct through the
hole cut for the inlet hood and attach to collar on
inlet hood using two (2) No. 6 x
³⁄₈" screws
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 Class 0 or Class 1 metallic duct.
INSTALLING THE CHIMNEY SYSTEM
Step 1. Check flue damper for proper opera-
tion. To open, push handle up and release.
Damper will open automatically. To close, pull
handle down and release damper will fall to the
closed position.
Note: The damper may be operated from both
firebox openings.
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" (51 MM)
CHIMNEY AIR SPACE TO COMBUSTIBLE
FRAMING MEMBERS THROUGHOUT VERTI-
CAL OR OFFSET CHIMNEY INSTALLATION.
ALSO MAINTAIN AIR SPACE ON TOP OF THE
FIREPLACE AS DEFINED BY THE SPACERS
AND STANDOFFS.
Nailing
Flange
Framing
Stud
Plumb Line
Figure 27
Figure 28
Step 3. Position appropriate firestop spacer at
ceiling and nail temporarily with two (2) 8d
nails. Use flat firestop spacer, Model F8FS-2,
if chimney penetrates ceiling vertically. If chim-
ney penetrates ceiling at 30
°
angle (offset
chimney), use Model F8FS30-2. Nailed, one
each on opposite sides to hold firestop spacer
in position. Nail permanently, using at least
two (2) more 8d nails, after chimney sections
have been assembled through the firestop
spacer and after any necessary adjustments
have been made. Firestop spacer must be
secured by at least four (4) 8d nails when
completely installed.