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8.10 Horizontal Venting (Category III) 4 in. (10 cm) Pipe
Note:
A continuous section of type B-vent may only be used to pass through the outside wall or outside of the
building. Horizontal venting (Category III) does not allow the use of type B-vent inside of the space.
SIDE VIEW
Combustible or
Non-Combustible Wall
Non-Combustible Wall Only
Vent Adapter
4" (10 cm)
Single Wall Pipe
Vent Terminal
4" (10 cm)
Single Wall Pipe
Vent Adapter
18" (46 cm)
Min.
Vent Terminal
Description
Vent Terminal (Comb. Wall)
Vent Terminal
8.11 Vertical Venting (Category III) 4 in. (10 cm) Pipe
Note:
A continuous section of type B-vent may only be used to pass through the roof or outside of the building.
Vertical venting (Category III) does not allow the use of type B-vent inside of the space.
SIDE VIEW
4" (10 cm) Vent Cap
4" (10 cm) Vent Pipe
Roof Flashing
Roof
All vent pipe inside the space
for a Category III configuration
must be single wall vent pipe.
Approved Thimble
(if applicable)
Vent
Adapter
4" (10 cm) Single Wall Pipe
Description
Vent Cap 4 in. (10 cm)
Note:
It is required that all vent pipes and connectors be fastened together with sheet metal screws and sealed
with high temperature silicone sealant approved for at least 550 °F (288 °C) (supplied by others). The installer
must perform a leak test on the complete venting system. A solution of soap and water should be used to test
the venting system.
2 ft (0.61 m)
Min.
Summary of Contents for IRH
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