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DV425TR DIRECT VENT ROOM HEATER
02/01 Page 36 250-5533
Step 8.
Twist-lock the vent cap and seal.
Note:
(1) For multi-story vertical installations, a ceiling firestop (SDV part #963) is required at the second floor, and
any subsequent floors (Figure 16). The opening should be framed to 10” x 10” (254mm x 254mm) inside
dimensions, in the same manner as shown in Figure 13.
(2) Any occupied areas above the first floor, including closets and storage spaces, which the vertical
vent passed through must be enclosed. The enclosure may be framed and sheetrocked with standard
construction materials; however, refer to these installation instructions for the minimum allowable clearance
between the outside of the vent pipe and the combustible surfaces of the enclosure. Do not fill any of the
required air space with insulation.
VERTICAL INSTALLATION, cont.
Figure 16
MIN. 1' CLEARANCE
CEILING FIRESTOP
NAILS
MIN. 1' CLEARANCE
MIN. 1' CLEARANCE
MIN. 1' CLEARANCE