How Air Washers Work

Air washers remove many types of household allergens — including dust, dust mites, pet dander, pet hair, mould spores, pollen, and other airborne particles — while adding moisture to the air. The most popular types of air washers use impeller technology. This technology uses a series of spinning discs (often 30 or more) to continuously filter out allergens and particles from the air as it is drawn into the unit. Large allergens collect on the discs as a continuous bath of water rinses them away and deposits them at the bottom of the unit. The discs then propel clean water through a special diffusing screen that breaks it down into a fine mist that blankets your air. Most tabletop models can disperse around a gallon of humidity total per day.

Another fairly less common type of air washer uses a particle pre-filter to filter out allergens and particles from inbound air prior to humidifying your room. These models use evaporative humidifying technology to add moisture to your space. The pre-filter is usually the same as the evaporative wick filter, which “wicks” up water while a fan blows to generate a fine mist. This filter also removes mineral deposits from the water, an added benefit if you have hard water.

Shopping for an Air Washer

Shopping for an air washer humidifier doesn’t have to be confusing. In fact, you’ll need to consider just a few things as you browse models.

Type

The type of air washer you choose depends mainly on your preference in humidification technology. Evaporative humidifiers, for example, are ideal for larger rooms since they use internal fans to push humidified air to nearly every corner of the space. In contrast, impeller humidifiers are fanless and ideal for smaller spaces. Plus, with the absence of a fan, these units tend to be a little quieter than evaporative air washers. You also might think about future maintenance needs when picking your model. Filter-based air washers, for example, will need periodic filter replacements, which will add to your cost of ownership. Impeller air washers don’t need filter replacements, but they will need more frequent cleaning than a filter-based model since particles and debris fall to the bottom of the unit.

Size

Most air washer humidifiers on the market today are portable tabletop units that will treat up to one room at most. However, each model may treat a different size room and release more or less moisture per day. When browsing models, look for a recommended square foot coverage area listed in the specifications and compare that with your room’s size. Consider choosing a slightly larger air washer than you think you’ll need in order to ensure optimal humidifying and air washing.

Features

Added features help make an air washer easier to use and maintain. When shopping, compare the feature line-up for each model and decide if there are any must-have features on your list. Popular air washer features include:

• Multiple fan speeds
• Digital controls
• Adjustable humidistat
• Low-water indicator with automatic shutoff
• Filter change indicator
• Fragrance container

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