Rinnai Commercial Hybrid System Installation and Operation Manual
27
Combustion air provided to the appliance should not be taken from any area of the structure that may produce a
negative pressure (i.e. exhaust fans, powered ventilation 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.
Location
To maintain proper circulation of combustion air two permanent
openings (one upper, one lower) must be positioned in confined
spaces. The upper shall be within 12 in. (0.30 m) of the top of the
confined space and the lower opening shall be within 12 in. (0.30 m) of
the bottom of the confined space. Openings must be positioned as to
never be obstructed.
Louvers and Grills
When sizing the permanent opening consideration must be taken for the design of the louvers or grills to maintain the
required free area required for all gas utilizing 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
Combustion Air (Continued)
12 in.
(300 mm)
10 in.
