An air handler,also know as air handling unit (often abbreviated to AHU), is a
device used to regulate 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,
furnace or A/C 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 exhausting air to the atmosphere and bringing
in fresh air.
Sometimes AHUs 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 makeup air unit (MAU) or fresh air handling unit
(FAHU). An air handler designed for outdoor use, typically on
roofs, is known as a packaged unit (PU), heating and air
conditioning unit (HCU), or rooftop unit (RTU).
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"Guangdong Province Innovative Small and Medium sized Enterprise",
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Enterprise".
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