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Ultra Aire 98H / 120H Installation Instructions
Ultra-Aire.com | (800) 533-7533
The recommended installation creates a separate return for the Ultra Aire Dehumidifier in a central area
of the structure. Duct the supply of the unit to the air supply of the existing HVAC system. Connect an
insulated duct from outside to the 6" collar of the Ultra Aire Dehumidifier to provide fresh make-up air.
DUCTING TO HVAC SYSTEMS
CAUTION!
CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT (800) 533-7533 FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All flexible ducting connected to the Ultra Aire Dehumidifier should be UL listed.
• A short piece of flexible ducting on all Ultra Aire Dehumidifier duct connections is recommended to reduce
noise and vibration transmitted to rigid ductwork in the structure.
• Use a minimum 10" diameter round or equivalent rectangular duct for total duct lengths of up to 25'. Use
a minimum 12" diameter round or equivalent rectangular duct for longer lengths.
• Grills or diffusers on the duct ends must not excessively restrict airflow.
• Effective dehumidification may require that ducting be branched to isolated, stagnant air flow areas. When
ducting to two or three areas, use 8" or larger diameter branch ducting. When ducting to four or more
areas, use 6" or larger diameter branch ducting. Provisions must be made to provide airflow from supply
locations to the central return location. Proper air distribution is important to ensure even humidity control
and heat distribution throughout the structure.
• DO NOT locate the return in a bathroom or a kitchen.
