Initial Installation
QUALIFIED INSTALLERS ONLY
NOTES:
(a)If an offset is necessary in the attic to avoid obstructions, it is important to support the vent pipe every 3 feet (91 cm), to avoid excessive stress on the elbows, and possible separation. Wall straps are available for this purpose (see Figure 32).
(b)When ever possible, use 45° degree elbows instead of 90° degree elbows. The 45° degree elbow offers less restriction to the flow of flue gases and intake air.
(c)For multi story installations. A ceiling firestop is required at the second floor, and any subsequent floors (see Figure 33). The opening should be framed to 10” (25.4 cm) x 10” (25.4 cm) inside dimensions, in the same manner as shown in Figure 28.
(d)Any occupied areas above the first floor, including closets and storage spaces, which the vertical vent passes through, must be enclosed. The enclosure may be framed and sheet rocked with standard building materials. However consult the appliance manufactures 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 required air spaces with insulation
Figure 33: Multi-Story Vent Pipe Installation.
Figure 32: Use of Wall Straps.
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