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Duct Connections / Air Distribution Ductwork
Duct Connections –
Supply Duct
Attach supply ductwork to the outside flange of the air discharge end of the unit.
Return Duct
Attach the return ductwork to the air return side (bottom or side) using sheet metal screws or
other fasteners.
Air Distribution Ductwork –
Existing Ductwork
The installer must inspect all of the previously installed air distribution system to ensure
suitability for the new heating and or cooling system.
Duct Vapor Proofing
All ductwork must contain adequate vapor seals to ensure moisture does not condense in the
insulating material.
Ductwork Installation
Connect the supply air duct over the outside of the 3/4-in. flange on the unit's discharge side.
Secure the duct to the flange using fasteners for the type of duct being used. Use flexible
connectors between the duct and unit to prevent transmission of vibration sounds.
Ductwork Acoustical Treatment
Galvanized or metal duct that do not include a 90º elbow with turning vanes or a main trunk of
10 ft in length between the hydronic air handler and the first branch may require internal
acoustical lining.
Alternatively, fibrous duct-board may be used if constructed and installed in accordance with
the latest SMACNA construction standards for fibrous glass ducts and compliance with the
NFPA, while meeting UL Standard 181 for Class 1 air ducts.
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Rinnai Corporation Hydronic Air Handler 101 Training Manual
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