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Ultra-Aire 98H

The most energy efficient Whole House Ventilating Dehumidifier in the 90 – 100 pint category.

Ultra-Aire 98H Specifications

Part Number: 4034240

Blower: 320 CFM @ 0.0″ WG
297 CFM @ 0.2″ WG
215 CFM @ 0.4″ WG

Supply Voltage: 115 VAC – 1 Phase – 60 Hz

Current Draw: 5.9 Amps

Energy Factor: 2.95 L/kWh

Operating Range: Between 49°F and 95°F Max

Sized For: Up to 2,300 Sq. Ft. – Typical

Minimum Performance at 80°F and 60% RH
Water Removal: 98 Pints/Day
Efficiency: 6.1 Pints/kWh

Air Filter:

Standard MERV 13,
Mini Pleat;
Size: 14″ x 17.5″ x 1.75″;
Efficiency: 65% ASHRAE Dust Spot
Optional MERV 14, Embossed Pleat;
Size: 20″ x 24″ x 4″;
Efficiency: 95% ASHRAE Dust Spot

Power Cord: 9′, 115 VAC, Ground

Drain Connection: ¾″ Threaded Female NPT

Drain Hose: ⅝″ ID x 8′ Direct Gravity Drain Hose

Dimensions: 14.5″W x 19.5″H x 26″L

Weight: 80 Lbs.

Optional Accessories

Attic Installation

Ultra-Aire 98H Attic Installation (Alternate Install Options)

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  1. The indoor air return should come from an open area on the first floor or main level of the home / building.
  2. The Ultra-Aire supply can be ducted into the forced air system past the air conditioning coil. The duct connection should be perpendicular to the air flow. You may also run an independent supply directly from the dehumidifier into a large open room. Depending on the application, multiple returns and or supplies may be needed.
  3. The optional six inch fresh air intake should be located at least six feet away from any exhaust ports, such as, dryer, range hood, or combustion device exhaust. Intake location should be consistent with local codes.
  4. A section of flex duct or vibration absorbing duct should be located between the connections of the Ultra-Aire ductwork and the forced air system ductwork. (When ducting into the forced air systems)
  5. A back draft damper should be installed when ducting into the forced air system. This prevents counter-flow of the A/C supply air through the UA 98H. A back draft damper is not needed when ducted independently.
  6. If placed over a finished area, a secondary drip pan is recommended.

Please Note: Therma-Stor does not recommend drawing air from the return ducting system and discharging into the supply, because it could reduce the capacity and may cause potential counterflow through the unit. Preferred installation is to draw air from a separate intake duct located in the central part of the home. Duct the outlet air into the supply duct for distribution throughout the home. A backdraft damper prevents air from the supply duct from being pushed backward through the Ultra-Aire 98H when central (A/C) fan is on and the Ultra-Aire fan is off.

Basement Installation

Ultra-Aire 98H Basement or Crawlspace Installation (Alternate Install Options)

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  1. Indoor air return should come from an open area of the first or second floor.
  2. The Ultra-Aire supply should be ducted into the forced air system supply beyond the air conditioning coil. The duct connection should be perpendicular to the air flow.
  3. An optional ten inch tee fitting with an adjustable blade damper on the straight run may be attached at the Ultra-Aire supply. This allows for increased air flow to the basement/crawlspace during the summer months.
  4. The optional six inch fresh air intake should be located at least six feet away from any exhaust ports, such as, dryer, range hood, or combustion device exhaust. Intake location must be consistent with local codes.
  5. A section of flex duct or vibration absorbing duct should be located between the connections of the Ultra-Aire ductwork and the forced air system ductwork.
  6. The backdraft damper prevents counter-flow of the A/C supply air through the Ultra-Aire 98H.

Please Note: Therma-Stor does not recommend drawing air from the return ducting system and discharging into the supply, because it could reduce the capacity and may cause potential counterflow through the unit. Preferred installation is to draw air from a separate intake duct located in the central part of the home. Duct the outlet air into the supply duct for distribution throughout the home. A backdraft damper prevents air from the supply duct from being pushed backward through the Ultra-Aire 98H when central (A/C) fan is on and the Ultra-Aire fan is off.

The Ultra-Aire 98H is designed to deliver exceptional indoor air quality by providing dedicated moisture control, fresh air mechanical ventilation and superior air filtration (MERV 13) to the entire home. The unit will dehumidify areas up to 2,300 square feet and features an extremely well-insulated, compact horizontal cabinet (optional vertical discharge) for the ultimate in quiet operation.

Optional fresh outdoor air may be ducted to the unit via a six inch round duct. This provides fresh air to dilute pollutants and maintain high oxygen content in the air. The amount of fresh air ventilation can be regulated by a variety of dampers and controls.

The Ultra-Aire 98H includes air filtration to improve indoor air quality. A MERV 13 media filter is standard. An optional external MERV 14 filter box and deep pleated 95% media filter is available for optimum air filtration and to reduce potentially harmful airborne particles. If the optional filter is chosen, a standard filter operates as a prefilter.

See The Ultra-Aire 98H In Action

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The Inside Story On Humidity & Fresh Air

Clear The Air
With Teddy Bear

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See more videos on our Youtube Channel.

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Ask This Old House’s Richard Trethewey helps New Orleans homeowners solve high humidity issues in their 1940s-era raised basement home.

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Did You Know?

Ultra-Aire dehumidifiers provide superior indoor air quality through fresh air ventilation and humidity control

Lowering your AC to dehumidify your home can cause condensation resulting in mold.

Ultra-Aire dehumidifiers help reduce the risk of serious health issues through filtration, ventilation, and moisture control.

Overcooling your home to control humidity will make you feel uncomfortable and raise your utility bill, and what do you do in spring and fall.