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Skuttle 55-UD Flow Through Humidifier

Skuttle 55-UD Flow-Through Under Duct Humidifier

Model: 55-UD | SKU: sk3424
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Price: $149.95
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Additional Warranty Options Available
1-Year Extended Warranty (Product Replacement) ($19.95) Details
2-Year Extended Warranty (Product Replacement) ($26.95) Details
  • Product Overview

    Itchy skin, a scratchy throat, dry nasal passages, static shocks, and more - these symptoms and others are commonly triggered by dry indoor air in the wintertime. While a portable tabletop humidifier may give you temporary relief, its benefits usually only extend to a small area and not your entire home. Using a whole house humidifier like the Skuttle 55-UD Flow-Through Under Duct Humidifier is ideal when you need comfortable moisture to every room of your home.

    How It Works

    The Skuttle 55-UD Under Duct Humidifier works with your furnace to distribute humidified air throughout your home. It is designed to mimic nature's process of warm air evaporation with the help of a porous evaporator pad. As warm air from your furnace passes over the evaporator pad, water evaporates evenly into the warm air stream. Your heating system then circulates the humidified air throughout your home. Using Skuttle 55-UD regularly can restore your home's humidity to a healthier and more comfortable 30 to 45 percent.

    Coverage Area

    The Skuttle 55-UD Humidifier can humidify homes up to 4,762 square feet, depending on your home's insulation level. Use the guidelines below to determine whether or not this model will work for your home.

    Maximum Home Size Tight House Average House Loose House
    Total Square Feet 4,762 sq. ft. 3,030 sq. ft. 2,174 sq. ft.
    Total Cubic Feet 38,095 cu. ft. 24,242 cu. ft. 17,391 cu. ft.
    • Tight House - Tight houses have insulated walls and ceilings, vapor barriers, weather stripping on doors and windows, snug doors, snug windows, and a fireplace damper. One-half air change per hour. 
    • Average House - Average houses have insulated walls and ceilings, vapor barriers, loose doors, loose windows, and a fireplace damper. One air change per hour.
    • Loose House - Loose houses have no insulation, storm doors, storm windows, weather stripping, or vapor barriers. Two air changes per hour.

    Additional Benefits and Features

    • Output Per Day - The Skuttle 55-UD Whole House Humidifier disperses 20 gallons of comfortable moisture per day.
    • More Humidity - This humidifier's under duct design allows air to pass directly through your ductwork, providing you with more humidity than bypass whole house humidifiers.
    • Humidistat Control - Set your desired humidity with the external humidistat. When your home's air is drier than the set humidity level, the humidistat activates the humidifier.
    • Compact - This model is mountable on horizontal ducts as small as 12 inches wide and 8 inches high.
    • Low Energy - Electrical consumption is about the same as a 25-watt light bulb.
    • Low-Hassle Mounting Frames - The included mounting frames are easily removed when it's time for maintenance and cleaning.
    • Rust-Proof Cabinet - The humidifier features a sturdy thermoplastic cabinet that resists rust, corrosion, and warping.
    • No Impurities - As water is evaporated, common impurities, bacteria, and other pollutants are left behind, creating clean humidity.


    The Skuttle 55-UD Flow-Through Under Duct Humidifier is a single, low-energy solution for comfortable humidity in every room of your home.

    What Customers Love

    • Low Maintenance - In most cases, you'll only need to clean this humidifier once a year to keep it running optimally.
    • Lowers Heating Costs Too - Keeping your home's humidity at an optimal level can actually lower your winter heating costs, since you feel warmer in a humidified environment.

    Things To Consider

    • Consider Your Home's Size and Insulation Level - The coverage area of this humidifier depends on your home's insulation level. Use the Coverage Area guidelines above to accurately estimate how well this humidifier will treat your home. 
    • Professional Installation - Skuttle recommends that its furnace humidifiers be installed by a professional HVAC technician.

    Manufacturer's Warranty

    1-Year-Limited Warranty

    Manufacturer's Literature

    User's Guide for the Skuttle 55-UD Flow-Through Under Duct Humidifier
    User's Guide for the Skuttle 55-UD Flow-Through Under Duct Humidifier

    What's In The Box?

    • Skuttle 55-UD Under-Duct Humidifier
    • Manual Humidistat
    • Self-Piercing Saddle Valve
    • 24-Volt Transformer
    • Mounting Hardware
    • Installation Instructions
    • Owner's Manual

    View All Humidifiers »
  • Specifications

    Humidifier TechnologyEvaporative
    Type of HumidifierCool Mist
    Coverage Area4762 sq. ft.
    Ideal ForWhole House
    Height14 in.
    Width19.5 in.
    Depth15.25 in.
    Moisture Output Per Day20 gallons
    Water Refill IndicatorNo
    Humidistat Yes
    Humidity DisplayNo
    Mist Output ControlYes
    Programmable TimerNo
    Wick FilterYes
    Frequency of Filter ReplacementsReplace every 6 months or more frequently if you have hard water
    Air FiltrationNo
    Germ ProtectionNo
    Demineralization CartridgeNo
    Medicine CupNo
    Automatic Safety ShutoffNo
    Voltage110-120 V
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