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The maximum vertical (top vent) system consists of:
Up to 30' (9145 mm) of vertical height
Fire stop
Flashing
Collar
Low profile termination cap 0980
A rear vent system consists of: “No elbow is allowed in this set-up”
Up to a maximum of 24” (610mm) of horizontal length
Decorative wall thimble cover
Wall Thimble
36” Vent Snorkel #981 (only)
Use a ceiling fire stop when penetrating a ceiling. Use a round support box/wall thimble when
penetrating an inside wall, or on an outside wall, only when additional support or decorative trim is
required. The round support box is not required on basic installations. Vent terminals shall not be
recessed into a wall or siding.
NOTE:In Canada local codes may require the use of a wall thimble on horizontal terminations. Use
part # 942.