3. Class A Metal Chimney
Termination Cap
Top Adaptor
Flashing
Existing
Metal Chimney
System4 in. (102mm)
Flex Pipe
Retro Connector
Direct Vent Pipe
Figure 5.20
Step 4.
Pass the flex pipe down through the center of the chimney system, and center the top adapter on the top of the chimney pipe. Drill four 1/8 in. (3mm) diameter holes through the top adapter, and into the chimney top. Ensure that you are drilling into the metal on the chimney. Twist lock the high wind termination cap onto the top adapter (Figures 5.22 and 5.23).
Figure 5.22
CAUTION |
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| High Wind Termination | ||
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| Cap |
Ensure that existing chimney is functionally sound and clean. |
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•Have inspection done by qualified chimney sweep or professional installer BEFORE converting to direct vent
appliance.
Step 1. |
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| Sheet Metal Screws |
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Remove existing chimney cap. |
| Drill Four 1/8 in. |
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| (3mm) Diamater |
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Step 2. |
| Holes |
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Measure the distance from the top of the chimney to the |
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bottom of the ceiling support box, add 3 in. (76mm) to this |
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measurement, and cut a section of 4 in. (101mm) flex pipe |
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to that length (the flex should be fully extended). | Figure 5.23 |
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Step 3. |
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Connect the end of the flex pipe section to the underside | Step 5. |
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of the top adapter, using four sheet metal screws (Figure |
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5.21). |
| Pull the flex pipe down through the ceiling support box, until | |
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| it protrudes approximately 3 in. (76mm). Connect the flex | |
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| pipe to the retro connector, and attach with sheet metal | |
| Top Adapter | screws. |
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| Step 6. |
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Flex Pipe |
| Push the flex pipe back up into the ceiling support box, | |
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| center the retro connector, and attach it to the support box | |
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| with sheet metal screws. |
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| Sheet Metal Screws | Step 7. |
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| The connection between the appliance and the retro | |
Figure 5.21 |
| connector may be completed with sections of direct vent | |
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| pipe. |
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July 29, 2008 | Page 19 |