What is an Air Handler?

Your air handler is an essential part of your “split” heating and cooling system. It is the indoor portion that delivers the cooled air in the summer and heated air in the winter — quietly and economically.

Installing the correct indoor or evaporator coil is essential for getting the highest performance and comfort from your central air conditioning or heat pump system.

Wikipedia explains it as:

An air handler, or air handling unit (often abbreviated to AHU), is a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU. Sometimes AHU’s discharge (supply) and admit (return) air directly to and from the space served without ductwork.

Small air handlers, for local use, are called terminal units, and may only include an air filter, coil and blower; these simple terminal units are called blower coils or fan coil units. A larger air handler that conditions 100% outside air, and no recirculated air, is known as a make-up air unit (MAU). An air handler designed for outdoor use, typically on roofs, is known as a packaged unit (PU) or roof-top unit (RTU).

The air handler is normally constructed around a framing system with metal infill panels as required to suit the configuration of the components. In its simplest form the frame may be made from metal channels or sections, with single skin metal infill panels. The metal work is normally galvanized for long term protection. For outdoor units some form of weatherproof lid and additional sealing around joints is provided.

Larger air handlers will be manufactured from a square section steel framing system with double skinned and insulated infill panels. Such constructions reduce heat loss or heat gain from the air handler, as well as providing acoustic attenuation. Larger air handlers may be several meters long and are manufactured in a sectional manner and therefore, for strength and rigidity, steel section base rails are provided under the unit.

Where supply and extract air is required in equal proportions for a balanced ventilation system, it is common for the supply and extract air handlers to be joined together, either in a side-by-side or a stacked configuration.

For a FREE estimate on a new air handler or system, call us today at 843.236.7142

 

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Ref: Goodman & Wikipedia 2013