Install The Attic Insulation Shield; Double-Check The Chimney Assembly; Secure The Chimney - Heatilator ST42A Owner's Manual

E. Install the Attic Insulation Shield
An insulation shield must be installed when there is a pos-
sibility of insulation coming into contact with the factory built
chimney system.
• Bend the tabs at the top of the attic insulation shield inward.
This will help keep the chimney section centered in the
shield.
• Position the shield over the vertical chimney section where
it penetrates a fi restop spacer.
• Slide the shield down until it rests on the fi restop spacer.
The fi restop spacer will support the insulation shield. See
Figures 5.6 and 5.7.
WARNING
Fire Risk
• DO NOT pack insulation or other
combustibles: between fi restops; between
chimney and attic insulation shield.
• ALWAYS maintain specifi ed clearances
around chimney and fi restop systems.
• Install fi restops as specifi ed.
Failure to keep insulation or other material
away from chimney pipe may cause fi re.
F. Double-check the Chimney Assembly
Continue assembling the chimney sections up through the
fi restop spacers as needed. While doing so, be aware of
the height and unsupported chimney length limitations given
under Section 5.A. Chimney Requirements.
Check each section by pulling up slightly from the top to en-
sure proper engagement before installing the succeeding
sections. If they have been connected correctly, they will not
disengage when tested.
G. Secure the Chimney
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 hanger straps for securing these
parts to joists or rafters. See Figure 5.8.
* or equivalent #6 or #8 sheet metal screw no longer than
3/4 in. (19 mm).
WARNING
Fire Risk
• Secure offsets with screws.
• Secure returns with strapping.
Keep chimney sections from separating or
twisting.
Figure 5.6
Figure 5.7
Figure 5.8
Heatilator • ST42A • 35038 Rev G • 02/05
24 in.
(610 mm)
Insulation
13 in.
(330 mm)
Chimney
Install Attic Insulation Shield Above the Ceiling
17 in.
(423 mm)
Insulation
24 in.
(610 mm)
13 in.
(330 mm)
Chimney
Install Attic Insulation Shield Below the Ceiling
STRAPS
OPTIONAL
ADDITIONAL
SUPPORT

Secure the Chimney

Tabs
17 in.
(423 mm)
Attic
Insulation
Shield
Firestop Spacer
Tabs
Attic
Insulation
Shield
Firestop Spacer
FIRESTOP
JOINT
BAND
(OPTIONAL)
19