Owner's Manual

C199 Manual 9
Common Vent & Commercial Hybrid System Applicaons Only
Combuson air provided to the appliance should
not be taken from any area of the structure that
may produce a negave pressure (i.e. exhaust fans,
powered venlaon fans).


When using air from other room(s) in the building,
the total volume of the room(s) must be of adequate
volume (Greater than 50 cubic feet per 1000 Btu/hr).
Each Combuson air opening must have 
, but not
less than 100 square inches each.
When communicang 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 rang of all appliances in the
conned space.
Note: If ducts are used, the cross seconal area of the
duct must be greater than or equal to the required
free area of the openings to which they are
connected.
When communicang indirectly with the outdoors
through vercal ducts, each opening shall have a
minimum free area of 1 in
2
/4000 Btu/hr (550 mm
2
/
kW) of total input rang of all appliances in the
conned space. Combuson air to the appliance can
be provided from a well venlated ac or crawl
space.

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 Combuson Air Requirements are
followed that will provide sucient combuson
air for the appliance.
□ Ensure approved venng 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 combuson air.
□ Ensure that room air is only ulized in common
vented and/or commercial hybrid system
applicaons.
□ Ensure if installed in common vent and/or
commercial hybrid system applicaons ulizing
room air that exhaust is terminang vercally
only. (Reference Common Vent manual for
further details.)
□ Installaon complies with Naonal Fuel Gas
Code, ANSI Z223.1/NFPA 54 as well as local and
state regulaons therein.


Exhaust
(Be sure to also maintain 12” above grade or
ancipated snow level)
Vent terminaon per ANSI Z223.1/NFPA 54.
For clearances not specied in ANSI Z223.1/
NFPA 54, clearances are in accordance with
local installaon codes and the require-
ments of the gas supplier.