That portion of supply air that comes from outside (outdoors) plus any recirculated air that has been treated to maintain the desired quality of air within a designated space.
Related Code Sections
615.5 Specific Appliances, Combustion and Ventilation Air
Combustion air shall not be taken from inside the sauna room. Combustion and ventilation air for a sauna heater not of the direct-vent type shall ...
630.3 Specific Appliances, (IFGS) Combustion and Ventilation Air
Where unvented infrared heaters are installed, natural or mechanical means shall provide outdoor ventilation air at a rate of not less than 4 cfm per ...
C403.7.3 [CE] Commercial Energy Efficiency, Ventilation Air Heating Control
Units that provide ventilation air to multiple zones and operate in conjunction with zone heating and cooling systems shall not use heating or heat ...
G2440.5 Fuel Gas, (615.5) Combustion and Ventilation Air
Combustion air shall not be taken from inside the sauna room. Combustion and ventilation air for a sauna heater not of the direct-vent type shall ...
C403.7.3 [CE] Commercial Energy Efficiency, Ventilation Air Heating Control (Mandatory)
Units that provide ventilation air to multiple zones and operate in conjunction with zone heating and cooling systems shall not use heating or heat ...