Air Handling Unit Cleaning

What you should know

Air handling units are devices that are used to circulate and regulate the fresh air within an HVAC system. AHU's are large metal boxes which contain cooling and heating elements as well as large fans to circulate the air.

They are generally connected to a ductwork ventilation system which distributes conditioned air around a building before returning it to the air handling unit.  

Air conditioning systems, if not cleaned regularly, can become a significant conduit for viruses, bacteria and odours to be circulated throughout the building, possibly contributing to levels of staff sickness. AHU cleaning includes removing dirt and debris, cleaning/disinfecting the blower motor (small, medium and large units are cleaned in place), cleaning heat exchangers, cleaning both sides of the evaporative coil(s), cleaning the housing of the coil and blower, and re-assembling the unit.  


If done in conjunction with duct cleaning, this will go a long way to eliminating all airborne pollutants from the ventilation system. It will also improve the overall efficiency of the system, saving energy and reducing running costs. In some cases this service can pay for itself in energy savings. A buildup of four one-hundredths of an inch (0.042) of dirt on a heating or cooling coil can result in a 21% decrease in efficiency.


Landmark Specialist Solutions use air powered cleaning units that can clean systems quickly and efficiently. Once cleaned, we will "Fog" the entire system using a fine disinfectant spray. This disinfectant spray settles on all surfaces within the unit, killing any remaining bacteria as it comes in contact with them, leaving the unit clean and sterile throughout.  

All parts of the system are covered including:

  • Air Handling Units

  • Turning Veins

  • Access Points

  • Evaporator Coils

  • Condensing Unit

  • Refrigerant Lines


On completion of works, the whole system is swab tested and the analysis that follows forms part of your cleaning report and sits behind your certification documents to complete Audit Protocols.