Heatilator NA36 Installation & Operating Instructions Manual page 18

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
Figure 14.
10. Cutting out the Hole in the Roof
Measure to either side of the nail and mark the
14½” x 14½” 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
roof framing details.
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 (TR344/NATR344), a round telescoping
termination cap (TR342) or a square termination cap
(ST375/TS345/TS345P). A chase installation must use
a chase top. Chase tops are available from your
Heatilator distributor. See page 22 for building a chase.
13. Installing the Outside Air Kit
The outside air kit is supplied as an optional 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 may be installed on either the left
hand or right hand side of the fireplace. Remove the
cover plate from the side of the fireplace assembly
where the air kit is to be installed. Install the outside
air kit as detailed in the installation instructions provided
with the outside air kit. See Figure 15 for handle
location/operation.
18
CAUTION:
17789 Rev H
NA SERIES INSTALLATION INSTRUCTIONS
14. Installing the Chimney Air Kit (Required in
Canada)
When installing the chimney air kit, follow the
instructions provided with this accessory.
for
15. Installing a Fan Kit
If a fan kit is desired, the FK18/NAFK18 fan kit contains
all material needed to complete the fan installation.
Follow the instructions provided with the fan kit.
If you are not going to install a fan kit at this time, we
recommend that you pre-wire by purchasing the JK8
junction box. In line with this junction box, you must
have an ON/OFF switch or a BC10. The FK18/NAFK18
fan kit can be added at a later date.
07/03