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13. VENTILATION REQUIREMENTS FOR INDOOR APPLICATION
WARNING
ing must be in accordance with all local, state, provincial, and national codes
(ANSI Z223.1/NFPA 54 in USA).
This heater is approved for unvented (indirect venting) application. Ensure that there is ade-
quate ventilation to supply combustion air and to dilute the products of combustion in accord-
ance with all local, state, provincial, and national codes. A balanced exhaust / inlet air system
is required to ensure that a negative air condition is not created. See below for a summary of
exhaust capacity requirements by the national codes in the U.S.A.
Air Supply: A "loose" building may not require any additional air supply if infiltration rates are
sufficient to offset exhaust volume. However, for "tighter" buildings, or if air movement is stag-
nant in an area, air can typically be supplied via inlet(s) with an area of 1 sq. in. per 1,000 Btuh
input (22 sq cm per kW). Locate air inlet(s) up at the level of the heaters to avoid cold drafts at
work level, and effectively supply combustion and dilution air to the heaters and balance the
system.
Heater Zoning: Exhausters are sized according to the input requirements of each controlled
zone of heaters. Multiple smaller zones are usually more effective in both comfort and ventila-
tion control than one large zone. Maximum zone size is limited by the total input that can be
handled by the capacity of an exhauster, and by the proximity of the exhauster to heaters in the
zone.
Exhauster Location & Proximity: Exhaust must be located as high as practicable in the
structure above the level of the heater(s) to effectively dilute and remove the warm (rising)
products of combustion. The exhauster should be as centrally located as practicable in the
zone of heaters. Rinnai recommends a maximum 6:1 ratio of the horizontal distance between
the exhauster and the furthest heater in a zone, to the height the heaters are mounted above
the floor . For example, if heaters are mounted 20 ft above the floor, then the exhaust fan
should be located no more than 120 ft from the furthest heater in the zone. Sufficient air supply
must be provided.
Exhauster Capacity:
USA: Natural or mechanical means shall be provided to supply and exhaust at least
3
4ft
/min/1000Btuh (0.38m
min/1000Btuh (0..43m
lock to a dedicated exhaust fan. Consult your local code and ANSI Z223.1 latest edition
for all venting requirements and practices.
Inadequate venting of a heater may result in asphyxiation, car-
bon monoxide poisoning, injury or death. Heating system vent-
3
/min/kW) Natural Gas input of installed heaters [4.5ft
3
/min/kW) Propane input]. Some local codes may require an inter-
19
SE+ Series Infrared Gas Heater Installation and Operation Manual
3
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