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VERTICAL TERMINATIONS (CONT.)
INSTALLATION INTO A CLASS A METAL CHIMNEY
NOTE: Have the existing installation inspected by a qualified chimney sweep or professional installer
prior to converting to direct vent. The existing chimney system must be in serviceable condition
and functionally sound and clean.
Step 1. Remove existing chimney cap.
Step 2. Measure the distance from the top of the chimney to the bottom of the ceiling support box, add
3” (76mm) to this measurement, and cut a section of 4” (102mm) flex pipe to that length (the flex
should be extended to its nominal length).
Step 3. Connect the end of the flex pipe section to the underside of the top adapter (SDV #985K, 986K
or 987K), using three sheet metal screws (Figure 19).
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” (3.3mm) diameter holes through the top adapter, and
into the chimney top. Insure that you are drilling into the metal on the chimney. Twist lock the high
wind termination cap (SDV #991) onto the top adapter (Figures 20 and 21).
Step 5. Pull the flex pipe down through the ceiling support box, until it protrudes approximately 3” (76mm).
Connect the flex pipe to the retro connector (SDV #909B), and attach with sheet metal screws.
Step 6. Push the flex pipe back up into the ceiling support box, center the retro connector, and attach it
to the support box with sheet metal screws.
Step 7. The connection between the appliance and the retro connector may be completed with sections
of direct vent pipe.
FIG. 21FIG. 20FIG. 19
SHEET
METAL
SCREWS