Service manual

SECTION 8: VENTING
35
8.10 Common Vertical Venting
Requirements:
• Heaters must be controlled by a common
thermostat.
• Connections to a common stack must be posi-
tioned to avoid direct opposition between streams
of combustion gases.
Roof
18" (46 cm)
Min.
Type "B" vent cap
(7" or 8") may be used.
(These are not available
from Roberts-Gordon.)
Roof
Flashing
Approved
Thimble
(If Applicable)
Type "B" Vent Pipe
4" (10 cm)
Single Wall Pipe
Vent Adapter
4" (10 cm)
Single Wall Pipe
Vent Adapter
D Area must equal sum
of open area of
individual vents.
D
Single Wall Pipe
The last section of vent pipe
passing through the roof or
wall may be Type "B" vent pipe.
All other vent materials in the
building must be single wall
vent pipe.
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