Air handler

[1] 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.

The air handler is normally constructed around a framing system with metal infill panels as required to suit the configuration of the components.

[2] Larger air handlers will be manufactured from a square section steel framing system with double skinned and insulated infill panels.

There are six factors for air handlers classifications and determine types of them, based on: But, the first method is very usual in HVAC market.

In fact, most of the company advertise their products by air handling unit applications: The major types of components are described here in approximate order, from the return duct (input to the AHU), through the unit, to the supply duct (AHU output).

If dehumidification is required, then the cooling coil is employed to over-cool so that the dew point is reached and condensation occurs.

These are driven using high efficiency EC (electronically commutated) motors with built in speed control.

For home AC fans, this can be a major problem: air circulation is greatly reduced at the vents (as wobble is lost energy), efficiency is compromised, and noise is increased.

Weights can be strategically placed to correct for a smooth spin (for a ceiling fan, trial and error placement typically resolves the problem).

To avoid this, vibration isolators (flexible sections) are normally inserted into the duct immediately before and after the air handler and often also between the fan compartment and the rest of the AHU.

The rubberized canvas-like material of these sections allows the air handler components to vibrate without transmitting this motion to the attached ducts.

The blower in the air handler also generates noise, which should be attenuated before ductwork enters a noise-sensitive room.

To achieve meaningful noise reduction in a relatively short length, a sound attenuator is used.

[1] The attenuator is a specialty duct accessory that typically consists of an inner perforated baffle with sound-absorptive insulation.