UTICA BOILERS UBSSC-299 Installation, Operation & Maintenance Manual page 28

FIGURE 6-7 Concentric Roof Terminal
Combustion Air
Roof boot/flashing
(field supplied)
Note: Support must
be field installed to
secure termination
kit to structure
Vent
FIGURE 6-8 Flue on Roof, Air Intake on Side Wall
Vent
FIGURE 6-9 Flue on Roof, Combustion Air
Vent
Combustion
6 - COMBUSTION AIR AND VENT PIPING
Vent
Maintain 12"(305mm) US
(18"(457mm) Canada)
clearance above highest
anticipated snow level 24"
(610mm) above roof
Support
(field supplied)
Combustion Air
Maintain 12"(305mm) US
(18"(457mm) Canada)
clearance above highest
anticipated snow level 24"
(610mm) above roof
Combustion Air
Maintain
12"(305mm) US
(18"(457mm)
Canada) clearance
above highest
anticipated snow
Snow line
Ground Level
Maintain 12"(305mm) US
(18"(457mm) Canada)
clearance above highest
anticipated snow level 24"
(610mm) above roof
24" (610mm)
Air * Minimum Length
Concentric
Vent Roof
Terminations
Grade, Snow
& Ice
Doors &
Windows
line
* See Tables
4 & 5
28
 Glue inner vent pipe to prevent
recirculation.
 Maintain 12" (305mm) US
(18"(457mm) Canada) minimum
clearance above highest anticipated
snow level. Maximum of 24"(610mm)
above roof.
 Support must be field installed to secure
termination kit to structure.
 Elbow, roof boot/flashing field supplied.
 Allowed Wall/Roof thickness 1/2"-30"
(12.7mm - 762mm).
 Vertical concentric vent system can be
installed in unused masonry chimney.
 Contact Technical Support 800-325-5479
for questions regarding installation or
use.
Maintain 12"(305mm) US (18"(457mm)
Canada) clearance above highest
anticipated snow level 24" (610mm) above
roof or ground.
Avoid locations where snow may drift and
block vent and combustion air. Ice or snow
may cause boiler to shut down if vent or
combustion air becomes obstructed.
Combustion air and vent termination must
be 12" (305mm) from or below doors,
windows or gravity inlet.
Combustion air and Vent Piping Length
Page 24 .
PN 240011320 Rev. G 10/01/2021]