07/03
17789 Rev H
17
NA SERIES INSTALLATION INSTRUCTIONS
WARNING!
Maintain a minimum of 2 air clearance to all
parts of the chimney system at all times!
Fail-
ure to maintain this 2 air clearance will cause
a structure fire.
CAUTION:
Inner flue and outer liner sections cannot be
disassembled once locked together. Plan
ahead to ensure the proper installation height
is achieved with the selected chimney compo-
nents.
Figure 12 - Installing an Attic Insulation Shield
Note:
You must provide support for the pipe during
construction and check to be sure inadvertent load-
ing has not dislodged the chimney section from the
fireplace or at any chimney joint.
WARNING!
When chimney sections exceeding six feet in
length are installed between an offset and re-
turn, structural support must be provided to re-
duce off-center loading and prevent chimney
sections from separating at the chimney joints.
Figure 13 - Offset/Return with Stabilizer
6. Attic Insulation Shield
An insulation shield should be installed when there is
a possibility of insulation coming into contact with the
factory built chimney system. The insulation shield is
installed by positioning it over the vertical chimney
section where it penetrates a firestop spacer. The
firestop spacer will support the insulation shield. See
Figure 12.
7. Double-checking the Chimney Assembly
Continue assembling the chimney sections up through
the firestop spacers as needed. While doing so, be
aware of the height and unsupported chimney length
limitations that are given on page 12 under Chimney
Requirements.
Check each section by pulling up slightly from the top
to ensure proper engagement before installing the
succeeding sections. If they have been connected
correctly, they will not disengage when tested.
8. Securing the Chimney System
When offsets and returns are joined to straight pipe
sections, they must be locked into position with the
screws provided (outer only), using the predrilled holes.
To prevent gravity from pulling the chimney sections
apart, the returns and the chimney stabilizers have
straps for securing these parts to joists or rafters. See
Figure 13.
