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Ultra-Aire MD33 in-wall Dehumidifier

List price: $1,800.00
You save: $410.00 (23%)

NOTE: this unit is should be installed by contractor for professional installation

The Ultra Aire MD33 is the first true in-wall dehumidifier that features a slim profile of only 5 ¾″ deep, allowing it to easily fit inside 2″ x 6″ or through 2″ x 4″ interior stud walls. A mounting kit is available to affix the unit to masonry and CMU block as well.

The Ultra Aire MD33 is energy efficient and runs independent of the HVAC system, removing up to 33 pints of water a day. Sized for up to 1,200 square feet, the MD33 is the perfect solution to control moisture in multi-family applications and features a digital RH control behind a tamper-proof cover.

The unit can be hardwired into existing electrical or directly plugged into a 110v outlet with the provided cord. Designed to drain directly into a hub-drain or plumbing line, the MD33 is truly a hands-off dehumidification system.


  • Designed for quiet operation
  • Washable air filter
  • Ability to be hardwired into existing electrical or directly plugged into a 110v outlet
  • Designed to drain into a hub-drain or plumbing line
  • Internally mounted digital dehumidistat


Part Number: 4035900
Blower: 155 CFM @ 0.0″ WG
Power: 324 Watts @ 80°F and 60% RH
120 Volt, hard-wired — electrical can be routed through bottom or out the back of the cabinet
Cord: Optional 10′ cord with plug end
Automatic Restart: Yes
Current Draw: 2.8 Amps
Energy Factor: 2.0 L/kWh
Operating Range: 49°F – 95°F
Sized For: Up to 1,200 Square Feet
Minimum Performance at 80°F and 60% RH
Water Removal: 33 Pints/Day
Efficiency: 4.25 Pints/kWh
Controls: Digital dehumidistat control internally mounted behind tamper-proof cover
Air Filter: ½″ Washable — mounted behind diffuser
Dehumidistat: Digital, tamper-proof, float switch input
Cabinet: Galvanized Steel
Cover: Tamper-proof, access lock-out
Decibels: 46 dBA
Drain Connection: ¾″ O.D.
Drain Hose: 10′ gravity fed (¾″ I.D.) hose, routed through the back, side, or bottom of the unit
Refrigerant Type: R134A (10 oz)
Coils: Electrophoretic coated coils — prevents corrosion and extends life of the unit
Utility Connections: Accessible from front for blind installation
Dimensions: Width: 14 316
Height: 30″
Depth: 5 ¾″D
Weight: Unit Weight: 39 lbs.
Shipping Weight: 57 lbs.
Blower Output :
155 cfm
Ultra Aire
14.2"W x 30"H x 5.8"D
Efficiency :
4.25 Pints/kWh
Energy Factor :
2.0 L/kWh
Max Coverage:
1200 ft²
Max. Moisture Removal (US) :
33 pints/day
Operating Range :
49°-95°F (10-35°C)
Power Draw :
2.8 amps
Pump Out :
  • Whole house
39 lbs
Shipping Weight:
57 lbs

Manual (UA-MD33-Manual.pdf, 2,004 Kb) [Download]

Spec Sheet (UA-MD33-Spec-Sheet.pdf, 445 Kb) [Download]

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