Detroit Radiant Products Company UH Series - Manual (Page 33)

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UH Series 3.0 Installation • Concentric Venting • Combustion Air Requirements
Concentric Venting
Contact the factory for concentric venting requirements.
Combustion Air Requirements
Combustion air may be supplied to the heater by indoor or outdoor means. Follow these
guidelines and all applicable codes for all models prior to installing the combustion air duct work.
Local codes may vary. In the absence of local codes, refer and comply with the National Fuel
Code ANSI Z223.1 (NFPA 54) latest edition or the National Standards of Canada.
This unit comes standard equipped for connection of supplied outdoor air for combustion. It is
designed for outside air to be brought into the appliance from combustion intake ducts, and is
referred to as a “Separated Combustion” on page appliance.
This heater must operate as a separated combustion system if any of the following criteria apply:
• Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants,
solvents, adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.) are
present in the atmosphere.
• High humidity.
• Contaminants such as sawdust, welding smoke, etc.
• Negative building pressure.
• Unusually tight construction where the air infiltration rate is less than 0.40 air changes per
hour.
If your application does not meet any of these criteria, then room air may be used as supplying
combustion air to the heater. Refer to ‘Room Air Combustion Systems’ on page 36 for details on
how to utilize room air for combustion.
Sufficient combustion air must be supplied to the appliance at all times.
Lack of combustion air may result in property damage, serious injury or death.
WARNING
!