// CODE SNIPPET
905.6.1 In Conjunction With Cooling Appliances
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Duct furnaces used in conjunction with cooling appliances shall be installed in parallel with or on the upstream side of cooling coils to avoid condensation within heating elements. With a parallel flow arrangement, the dampers or other means used to control the flow of air shall be sufficiently tight to prevent any circulation of cooled air through the unit.
Exception: Where the duct furnace has been specifically listed for downstream installation. [NFPA 54:10.10.6.2]