Air Conditioning System Inspections (HVAC)

Mould Worx (Mould, Mold, HVAC, Duct Remediation) 1102.JPG

6 Ways Your Air Conditioning System Is Affecting You

A poorly maintained Air Conditioning System can result in:

  1. Poor Hygiene from Airborne Bacteria, Viruses and Mould
  2. Complaints of Discomfort from Poor Temperature & Humidity Control
  3. Complaints of Bad Odour from bio- films and microbial off-gassing
  4. Higher Running Costs from an accumulation of Smoke and Dust Particles on internal components
  5. Sick Building Syndrome Symptoms (new terms for this include Multi-system Exposure Related Illness (MERI) and Chronic Inflammatory Response Syndrome due to Water Damaged Buildings (CIRS-WDB))
  6. Building Related Illnesses, such as Legionnaire’s disease, asthma, hypersensitivity pneumonitis, and humidifier fever 

A properly maintained ventilation system can provide:

  • A healthy indoor environment - so you can breath easy again
  • A comfortable working and living environment for everyone
  • Lower Running Costs from less resistance and properly functioning components
  • Peace of mind (and duty of care) for occupants that their ventilation system is not affecting their health
  • Protect your capital investment in your expensive plant and equipment


WARNING: Your air conditioning maintenance company is not very interested in keeping your system clean - because they don't do cleaning - they just fix the equipment.

Good HVAC Hygiene includes regular inspecting and testing. The Australian Standard AS/NZS 3666.2 sets inspection requirements and frequency for HVAC systems.

We have found that many systems are not fitted with Access Panels to allow inspection of the supply and return air ductwork. Our inspectors can install Access Panels so we can thoroughly examine and report on the state of your ductwork, the insulation and any other contamination such as mould growth.

Both surface and air samples can be taken which can be processed and analysed by our microbiology laboratory to give an estimate of the system's hygiene

Our reports provide you with a detail step by step scope of works to help you manage your duct cleaning contractors.  Detailed tender documents can also be prepared for larger scale jobs. 


Air-Conditioning System Inspections

Air Conditioning Unit Inspection (Domestic)

  • Your Air Conditioner is very efficient at trapping airborne particles. However, these need to be cleaned away every now and then. 
  • If you have a "swampy" or evaporative types use lots of water to cool the air and the materials use for evaporation and the drainage systems needs to be checked for blockages and mould and algae growth.  
  • Air filters need to be check to make sure they are not clogged so they allow air to pass through them.  Blocked filters cause excess electricity, poor airflow and can even cause air to bypass around them and let the dust particle damage you internal surfaces. 
  • Your cooling coils (and your heating coils) need to be checked to make sure they are not clogged so they can work properly.  
  • Mould and bacteria can build up on many of the internal components and these need to be assessed to make sure the unit is hygienically clean and not cause poor indoor air quality.  

Heating Ventilation and Air Conditioning (HVAC) System Inspection (Commercial)

  • Large HVAC systems have walk in chambers that allow for easy access and inspection. However, we rarely see systems that are well maintained. 
  • Air filtration media is often poorly fitted allowing unfiltered air to bypass and damage the internal surfaces. 
  • Cooling coils are not cleaned regularly and build up with dirt and debris and mould growth.  
  • Drainage tray and floor drains are often blocked and allow stagnant water to remain in the chambers. 
  • Perforated wall and ceiling lining become moisture damaged and can harbour hidden mould growth and constantly releasing spores into the air stream. 
  • Outdoor air intakes are often poorly designed and allow wind driven rain to wet the filters causing them to go mouldy.  
  • Return air chambers are often clogged with particulate matter creating in the building.  


Further reading:

AIRAH HVAC Hygiene Best Practice Guideline

USEPA HVAC Systems and Indoor Air Quality