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34922 Rev B 16 12-01
T4800 INSTALLATION INSTRUCTIONS
Figure 14 - Ceiling/Attic Construction
Figure 15 - Air Kit Handle Location
9. Marking the Exit Point of the Roof
Locate the point where the chimney will exit the roof
by plumbing down to the center of the chimney. Drive
a nail up through the roof to mark the center. See
Figure14.
10.Cutting out the Hole in the Roof
Measure to either side of the nail and mark the
17x17 or 17 x 26 opening required. This is
measured on the horizontal; actual length may be
larger depending on the pitch of the roof. Cut out and
frame the opening. See Chapter 25 of the Uniform
Building Code for Roof Framing Details.
Be sure to maintain a 2 minimum air space
between the chimney section and the roof.
11. Assembling the Chimney Sections
Through the Roof
Continue to add chimney sections through the roof
opening, maintaining at least a 2 air space.
12.Installing the Roof Flashing
If a roof flashing is to be used, install the roof flashing
appropriate to the roof pitch and install a round
termination cap following the instructions shipped
with the cap.
For chase installations you can use a round
termination cap (TR11), a round telescoping
termination cap (TR11T) or a square termination cap
(ST1175). A chase installation must use a chase top.
Chase tops are available from your Heatilator
distributor. See page 20 for building a chase.
13.Installing the Outside Air Kit
The outside air kit is supplied as a standard feature
with this fireplace and its use is highly recommended
to minimize the effects of negative pressure within the
structure. It is recommended to utilize the shortest
duct run to optimize the performance of the outside
air kit. The outside air kit inlet thimble should be
positioned at least four feet above the ground level,
in a manner that will not allow snow, leaves, etc. to
block the inlet.
The outside air kit is installed on the left hand side of
the fireplace. Remove the cover plate from the side of
the fireplace assembly where the air kit is to be
installed. See Figure 15 for handle location.
14.Installing the Chimney Air Kit
When installing the chimney air kit, follow the
instructions provided with this accessory.