21
Rinnai CVent
Combustion Air Requirements (
Commercial Applications with C199i Only
)
Combustion air provided to the system should
not be taken from any area of the structure that
may produce a negative pressure (i.e. exhaust
fans, powered ventilation fans).
NOTICE
Using Indoor Air For Combustion
When using air from other room(s) in the building,
the total volume of the room(s) must be of ade-
quate volume (Greater than 50 cubic feet per 1000
Btu/hr). Each Combustion air opening must have
at least one square inch of free area for each
1000 Btuh
, but not less than 100 square inches
each.
When communicating directly with the outdoors
through horizontal ducts, each opening shall have
a minimum free area of 1 in
2
/2000 Btu/hr (1100
mm
2
/kW) of total input rating of all appliances in
the confined space.
Note: If ducts are used, the cross sectional area of
the duct must be greater than or equal to the re-
quired free area of the openings to which they are
connected.
When communicating indirectly with the outdoors
through vertical ducts, each opening shall have a
minimum free area of 1 in
2
/4000 Btu/hr (550 mm
2
/
kW) of total input rating of all appliances in the
confined space. Combustion air to the appliance
can be provided from a well ventilated attic or
crawl space.
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY
OR DEATH DUE TO ASPHYXIATION,
COMMON VENTING WITH OTHER
MANUFACTURER’S INDUCED DRAFT
APPLIANCES IS NOT ALLOWED.
□
Verify proper clearances around the vents .
□
Ensure that the Combustion Air Requirements
are followed that will provide sufficient com-
bustion air for the appliance.
□
Ensure approved venting components have
been used.
□
All horizontal vent runs must be sloped up
away from the water heater a minimum of 1/4
“ (6 mm) per foot.
□
Verify that there is adequate combustion air.
□
Ensure that room air is only utilized in com-
mon vented applications.
□
Ensure if installed in common vent application
utilizing room air that exhaust is terminating
vertically only. (Reference Common Vent
manual for further details.)
□
Installation complies with
National Fuel Gas
Code, ANSI Z223.1/NFPA 54
as well as local
and state regulations therein.
Checklist for Combustion Air and
Venting Requirements
Exhaust
(Be sure to also maintain 12” above grade or
anticipated snow level)
Vent termination per ANSI Z223.1/NFPA
54. For clearances not specified in ANSI
Z223.1/NFPA 54, clearances are in
accordance with local installation codes
and the requirements of the gas supplier.
Summary of Contents for c199i
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