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DV425TR DIRECT VENT ROOM HEATER
02/01 Page 38 250-5533
INSTALLATION INTO A CLASS A METAL CHIMNEY (USA ONLY)
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”
(75mm) to this measurement, and cut a section of 4” (100mm) 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).
VERTICAL INSTALLATION, cont.
Top Adapter
Sheet Metal Screws
Flex Pipe
FIG. 19