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Fig.4
4. Frame Openings: Frame openings in each ceiling or floor above the
Support Box (Fig 7). These openings are to hold the Radiation Shield and Attic
Shield. Locate each opening by dropping a plumb bob to the four corners of
the opening below. Maintain the minimum clearances and dimensions as
specified in Table 1. If Elbows must be used to avoid an obstruction, refer to
the Offset Elbow Installation section.
Fig.5
Fig.6
5. Cut Roof Opening: Cut an opening in the roof directly above the opening
below, and at least 4 inches larger than the chimney's outside diameter to
provide at least a 2-inch clearance all around the chimney. The chimney must
be centered within this opening and maintain the 2-inch clearance to
combustibles.
6. Install Radiation Shield: A Radiation Shield is required in multistory
installations at each floor penetration above that where the Support Box is
located when the attic insulation shield is to be enclosed. Example: in a
multistory home where the appliance is on the ground floor (Support Box is in
the 1st floor ceiling), you would need a Radiation Shield at the 2nd floor ceiling,
and at the 3rd floor ceiling, etc., including where the chimney penetrates into
the attic. Figure 7 shows a typical 2-story installation with an attic. Note: a
Radiation Shield is not installed where the chimney penetrates through the roof.
The Radiation Shield is installed on the underside of the ceiling/floor framing,
with the cylindrical "tube" portion of the shield pointing upward (Fig 8). Use a
minimum of either (1) 8 penny nail or (1) #8, 1-1/2" wood screws per corner.
Refer to Table 1 for framing requirements.
5
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