Definitions for "AIR HANDLER"
Keywords:  blower, ductwork, coil, fan, indoor
In a forced air heating system this is the "box" containing the fan that circulates the air.
A blower unit that moves air across either, or both, a heating and/or cooling coil. This unit can have controls and motors that make it a variable speed or single speed unit.
a box that contains a blower and an a-coil