Fresh Air Ventilation - Ultra-Aire XT105H Installation & Operation Instructions

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Table of Contents

Fresh air ventilation is optional.

Fresh air may be brought into the structure by connecting an insulated duct from outside the structure to

the 6" inlet of the Ultra Aire Dehumidifier. A ventilation control is needed to program the time and frequency

that the unit introduces outside air. The time and frequency of ventilation should be based on the size and

occupancy of the residence.

• The fresh air ventilation duct should be connected to the 6" round collar on the front of the Ultra Aire De-

humidifier.

• An insulated 6" diameter duct on the XT155H and XT205H provides up to 100 CFM of outside air.

• An insulated 6" diameter duct on the XT105H provides up to 75 CFM of outside air.

• If a motorized damper is not being used, fresh air is controlled by the manual damper in the 6" collar

of the Ultra Aire Dehumidifier.

• Performance of the Ultra Aire Dehumidifier can be impacted by inside and outside air conditions.

• When a 6" motorized damper is used, a digital control is required.

• It may be necessary to use 8" duct work if additional fresh air is required.

• In cold climates or at times when the dew point is low, ventilation can be used to dehumidify the

structure, making the Ultra Aire Dehumidifier capable of year-round drying.

Fresh Air Ventilation With Dehumidifier Off and Fan Only Operation

Outside air mixes with the dehumidifier's return air before being supplied to the home. Outside

temperature, inside temperature and relative humidity will impact the combined outlet air conditions.

6" Fresh Air Inlet

(Optional)

10" Return Air Inlet

10" Supply Air Outlet

6" Fresh Air Inlet

(Optional)

10" Return Air Inlet

10" Supply Air Outlet

Note: Temperature and relative humidity may vary depending on duct distribution scheme.

Ultra Aire XT105H / XT155H / XT205H Installation Instructions