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The minimum vertical length using the maximum horizontal length consists of:
• A minimum of 24” (61cm) vertical length directly on top of the stove.
• A maximum of one 90 degree elbow.
• A maximum of 12” (31cm) total horizontal length.
• A wall thimble.
• A wall thimble cover.
• Horizontal termination cap.
For vertical termination:
The maximum vertical system consists of:
• Up to 30 feet (9m) of vertical length.
• Fire stop, flashing, and collar.
• High Wind termination cap.
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.
HORIZONTAL AND VERTICAL VENT CHART
Length of vertical
vent
Length of
horizontal
vent