14
Figure 18
Figure 19
SQUARE PORTION
OF SUPPORT BOX
NEEDS A MIN OF 2
INCHES CLEARANCE TO
FINISHED CEILING
18 INCH MIN CLEARANCE
FOR SINGLE-WALL
STOVEPIPE
CAP
ADJUSTABLE
FLASHING
CHIMNEY
SECTION
STORM
COLLAR
CHIMNEY
SECTION
FRAMED
OPENING
SQUARE
CEILING
SUPPORT BOX
OR REDUCED
CLEARANCE
SUPPORT BOX
CHIMNEY
SECTION
CHIMNEY
SECTION
CAP
ADJUSTABLE
FLASHING
CHIMNEY
SECTION
STORM
COLLAR
SQUARE
CEILING
SUPPORT BOX
OR REDUCED
CLEARANCE
SUPPORT BOX
CHIMNEY
SECTION
Installation Instructions for directions on how
to install the remainder of the Combustible Air
System. The Support Box must remain level,
and the top edge of the box must cover the
edge of the roof’s decking material. Square
Ceiling Support Boxes are available in 11-inch,
24-inch, and 36-inch heights. The Reduced
Clearance Support Box is available in 24”
length for 6” diameter chimney only. Mobile
home chimney installations are roof supported.
Do
not
seal openings in flashing.
1. Place Appliance:
Place the appliance in its
proper location, referring to the manufacturer’s
instructions as to allowable distances from
combustibles, etc.
2. Cut Openings:
Cut a roof opening in your
desired location, just as in a Ceiling-Supported
Installation (Steps 1 through 5). If a separate
