Rapid UHDS 100 Installation, operation & service manual - page 23
SECTION 7: V
ENTING
15 of 45
Figure 10: Standard Vented Heater - Common Vertical Vent Termination
Requirements:
• Maximum of four heaters can be commonly vented through the roof.
• Heaters must be of the same BTU output.
• Heaters must be controlled by a common thermostat.
• Connections to a common stack must be positioned to avoid direct opposition between streams of
combustion gases.
Roof
2'(.6 m)
Minimum
Type "B" vent cap
(7" [18 cm] or 8" [20 cm]) may be
used. (These are not available
from the manufacurer.)
Roof
Flashing
Approved
Thimble
(If Applicable)
Type "B" Vent Pipe
4" (10 cm)
Single Wall Pipe
4" (10 cm)
Single Wall Pipe
"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.
TOP VIEW
SIDE VIEW