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 firestops; 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
firestop 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.
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13 in.
(330 mm)
Chimney
Figure 5.6 Install Attic Insulation Shield Above the Ceiling
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13 in.
(330 mm)
Chimney | Firestop Spacer |
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Figure 5.7 Install Attic Insulation Shield Below the Ceiling
FIRESTOP
STRAPS
JOINT BAND
OPTIONAL(OPTIONAL) ADDITIONAL
SUPPORT
Figure 5.8 Secure the Chimney
Heatilator • ST42A • 35038 Rev G • 02/05 | 19 |