16
17804 Rev i
08/04
MH SERIES INSTALLATION INSTRUCTIONS
WARNING!
Maintain a minimum of 2 in. air clearance to all
parts of the chimney system at all times!
Fail-
ure to maintain this 2 in. 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 6 ft in length
are installed between an offset and return,
structural support must be provided to reduce
off-center loading and prevent chimney sections
from separating at the chimney joints.
Figure 13 - Offset/Return with Stabilizer
7. Double-check 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 11 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. Secure 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.
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.
a.
Bend the tabs at the top of the attic insulation
shield inward. This will help keep the chimney
section centered in the shield.
b.
Position the shield over the vertical chimney
section where it penetrates a firestop spacer.
c.
Slide the shield down until it rests on the firestop
spacer. The firestop spacer will support the
insulation shield. See Figure 12.
WARNING! RISK OF FIRE.
Do not fill the space between the chimney sec-
tion and the insulation shield with insulation.
