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NOTES:
(1) If an offset is necessary in the attic to avoid obstructions, it is important to support the vent pipe every 3 feet, to avoid
excessive stress on the elbows, and possible separation. Wall straps are available for this purpose. FIG-18
(2) 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.
NOTES:
(1) For multi story installations. A ceiling firestop (part 963) is required at the second floor, and any subsequent floors.
FIG-19. The opening should be framed to 10-inch x 10-inch inside dimensions, in the same manner as shown in FIG-
16.
(2) 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 sheetrocked 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.
FIG-21 FIG-22
FIG. 18 FIG.19
FIG.20
FIG. 20
10