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Ultra Aire XT105H / XT155H / XT205H Installation Instructions
Ultra-Aire.com | (800) 533-7533
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
OUTLET DUCT
COLLAR WITH
BACK DRAFT
DAMPER
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
AIR FLOW
Air
Flow
Hot Climate
6" Fresh Air Inlet
(Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
Outdoor Air
30°F, 65%RH
Indoor Air
70°F, 50%RH
Outlet Air
59°F, 51%RH
Cold Climate
A
B
C
6" Fresh Air Inlet
(Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
Mixed Air
59°F
51%RH
Mixed Air
59°F
51%RH
Outdoor Air
90°F, 65%RH
A
Indoor Air
70°F, 50%RH
B
Outlet Air
75°F, 65%RH
C
Mixed Air
75°F
65%RH
Mixed Air
75°F
65%RH
Outdoor Air
30°F, 65%RH
A
Indoor Air
70°F, 50%RH
B
Outlet Air
59°F, 51%RH
C
Mixed Air
59°F
51%RH
Mixed Air
59°F
51%RH
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.
Note: Temperature and relative humidity may vary depending on duct distribution scheme.
