Installation Sheet
Rinnai Tankless Water Heater Installaon and Operaon Manual 35
Combuson air provided to the appliance should not be taken from any area of the structure that may produce a
negave pressure (i.e. exhaust fans, powered venlaon fans).
NOTICE
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION, COMMON VENTING WITH OTHER
MANUFACTURER’S INDUCED DRAFT APPLIANCES IS NOT ALLOWED.
□ Verify all combuson air opening sizes are correct.
□ Ensure that the Combuson Air Requirements are followed that will provide sucient combuson air for the
appliance.
□ DO NOT use room air for combuson in applicaons where the indoor air is corrosive.
□ Verify that adequate combuson air is available for all appliances installed in the space.
□ Installaon complies with Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54 as well as local and state
regulaons therein.
Checklist for Combuson Air and Venng Requirements
Locaon
To maintain proper circulaon of combuson air two permanent
openings (one upper, one lower) must be posioned in conned
spaces. The upper shall be within 12 in. (0.30 m) of the top of the
conned space and the lower opening shall be within 12 in. (0.30 m) of
the boom of the conned space. Openings must be posioned as to
never be obstructed.
Louvers and Grills
When sizing the permanent opening consideraon must be taken for the design of the louvers or grills to maintain the
required free area required for all gas ulizing equipment in the space. If the free area of the louver or grill design is
not available, assume wood louvers will have 25% free area and metal louvers or grills will have 75% free area. Under
no circumstance should the louver, grill or screen have openings smaller than 1/4 in.
Example: Wood: 10 in x 12 in x 0.25 = 30 in
2
Metal: 10 in x 12 in x 0.75 = 90 in
2
Non-Direct Vent (Room Air)
2
Combuson Air (Connued)
12 in.
(300 mm)
10 in.
(250 mm)