Instruction

8
mark this center point on the ceiling. Refer
to Table 1 for specic framing and clearance
dimensions. Mark appropriate cutting lines
around the center point. Cut a square hole in
the ceiling for the Support Box. Frame a level,
square opening centered over the hole which
you have cut. (Fig.7 and 8).
3. Install Support Box: For installation into a
at ceiling, there is the option of the Round
Support Box (Round or Square Trim Collar),
Flat Ceiling Support Box, Square Ceiling
Support Box, or Reduced Clearance Support
Box. The Flat Ceiling Support Box is primarily
used for Oil Appliances and comes unpainted.
For the Round support box, the trim mounts
ush to the ceiling with the bottom protruding
a min of 3” below the ceiling (Fig.7). For the
Square support box, the square face must
protrude a min of 2” below the ceiling (Fig.7).
Level the Support Box and secure it to the
framing using at least three 8-penny nails
per side (min. of 12 total). Alternatively, you
may use 1-1/2” #8 wood screws (min. of 12
total), instead of nails. After the Support Box
is mounted, secure the Trim Collar (round or
square) to the framing members using the (4)
1” long, round-head wood screws provided
Figure 9
Figure 8
REF FIG. 7 FOR MIN
DISTANCE BELOW
CEILING FOR
SUPPORT USED
18 INCHES
MINIMUM FOR
SINGLE WALL
STOVEPIPE
ADJUSTABLE FLASHING
CHIMNEY SECTIONS
ATTIC INSULATION SHIELD
ROUND TRIM COLLAR
FRAMED OPENING
ROUND SUPPORT
BOX
CHIMNEY CAP
STORM
COLLAR
(Fig.9). For installation into a cathedral ceiling,
you must use the Square Ceiling Support Box
or Reduced Clearance Support Box and the
two-piece Trim. The bottom of the square
portion of the Support Box must be a minimum
of 2” lower (round portion is then an additional
3” lower) than the nished ceiling at the
lowest side of the penetration (Fig.9). Level
the Support Box and secure it to the framing
using at least three (3) 8-penny nails per side
(minimum of 12 nails total), or a minimum
of (3) #8, 1-1/2” wood screws. Adjust the
overlapping “U-shaped” Trim pieces so they
cover the Support Box, and secure them to the
SQUARE SUPPORT BOX
WITH TRIM FRAME IN
PLACE
WOOD SCREWS ARE
REQUIRED
MINIMUM OF
2” BELOW
CEILING
(a)
(b)