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An Air Handling Unit (AHU) is a large metal box that regulates and circulates air by taking in outdoor or recirculated air, conditioning it (filtering, heating, cooling, or humidifying), and then distributing it through ductwork to various rooms.
Core Components
Housing/Casing: An insulated metal enclosure that protects internal parts and reduces noise.
Filters: Remove dust, pollen, and bacteria. Standard units often use a coarse panel filter followed by a finer bag filter.
Blower (Fan): An electromechanical system that pulls air through the unit and pushes it into the building's ducts.
Heating & Cooling Coils: Heat exchangers that adjust air temperature using chilled water, hot water, steam, or refrigerant.
Humidifiers/Dehumidifiers: Control moisture levels to maintain comfort and prevent mold growth.
Mixing Chamber: A section where return air from the building is mixed with fresh outdoor air to improve energy efficiency
An Air Handling unit, also known as AHU, is a component used for air treatment, regulation and circulation in large HVAC systems. Some of its functions include collecting air, removing dust particles and adjusting temperature and humidity.
AHUs can be used in a wide range of buildings where fresh air isn’t easily available, such as shopping malls, restaurants, offices or industrial spaces. They are used for different purposes, among them:
Air purification and cleaning through filters. They can reduce and eliminate dirt, dust, and even bacteria.
Ventilation (bringing outside air in and optionally extracting dirty indoor air out)
Indoor humidity control to create comfortable environments
Regulating/conditioning the temperature (hot or cold)
FRAME MATERIAL
Outer Skin : 0.6 mm Pre-Coated G.I
Inner Skin : 0.6 mm Plain G.I
Frame Work : Hollow Extruded Aluminum Profile
Thickness of Insulated Panels : 25 (+/- 2) mm Thick, CFC Free PUF Injected, Density: 40 (+/- 2)Kg/Cu.m.
Isolator : Rubber Isolator
Pulleys : Taper lock
Material of Hinges & Locks : Hinges (Aluminum Die cast) & Nylon (Heavy Duty) Locks
DRAIN PAN : 20 Gauge thick Stainless steel (SS-304) Sheet
COOLING COIL SECTION
Cooling coil : Chilled Water type
No of rows of cooling coil : 6 rows deep
Material of tube of cooling coil : Copper
Material of fin of cooling coil : Aluminum
Copper tube OD : 12.7 mm (1/2’’)
HOT WATER COIL SECTION
No of rows of cooling coil : 2 rows deep
Material of tube of cooling coil : Copper
Material of fin of cooling coil : Aluminum
Copper tube OD : 12.7 mm (1/2’’)
FILTER SECTION
Filter Type : Pre Filters G3-G4 + Bag filters F5-F9
Filter make : Hemricore
Pre filter G3-G4 = Initial Pressure Drop (I.P.D.) - 4-5 mm WG & Final Pressure Drop (F.P.D.) - 10 mm WG
Bag Type Filter F5-F9 = Initial Pressure Drop (I.P.D.) - <6.5 mm WG. & Final Pressure Drop (F.P.D.) - 20 mm WG
Prefilters efficiency : 90 % down 10 microns
Bag filters efficiency : 95 % down to 3 microns
BLOWER SECTION
Blower Make : NICOTRA / BLOWTECH (AMCA Certified)
Blower Type : Centrifugal DIDW Backward Curved
Blower Diameter : 800 MM
No of Blowers : 02 Nos
Blower speed in RPM : 1114
Outlet velocity : 9.3 m/s
MOTOR SECTION
Motor Make : CROMPTON (CG)/ABB/HAVELLS
Motor Type : 25 H.P (18.5 KW),50 Hz TEFC Sq Cage, Induction Motor
No of Motors : 02 Nos
Mixing Box chamber : Yes, Included
Damper at Return Air : Yes, Included
Damper at Fresh Air : Yes, Included
Damper at Supply Air : Yes, Included
Static Pressure : 125 mm wg