Indoor air quality solutions

Indoor Air Quality (IAQ) refers to the air quality in a building or structure, breathed in every day by the building’s occupants. When planning new residential buildings, schools, offices or light commercial buildings, many things must be considered. Besides structural factors, there are also the topics of heating, cooling and something often neglected: indoor air quality.

Did you know that the indoor air we breathe, whether at home, at the office, or in a hotel room could in fact be much more polluted than the air outside?

  • 90% of our lives is spent indoors
  • Indoor air quality can be 2 to 5x worse than outdoor air quality because of pollutants, such as pollen, bacteria, etc.

Indoor Air Pollutants and Particles

With the right system (air conditioning, ventilation, air purification equipment) air pollutants such as pollen, spores, cement dust, bacteria, viruses or germs can be filtered out of the air. The smaller these particles, the more dangerous they are for our health, therefore the particulate matter is categorized based on their size.

Indoor Environment Quality Components

  1. Ventilation: Ensures the provision of fresh and clean air
  2. Energy recovery: Delivers energy savings by transferring heat and moisture between airflows thus helping to bring supply air to the required indoor conditions for temperature and humidity
  3. Air processing: Delivers the required conditioned air to optimize the energy efficiency of indoor HVAC equipment
  4. Humidification: Ensures the desired moisture level in the conditioned space
  5. Filtration: Ensures clean and healthy air by filtering out pollen, dust, odours and other contaminants that are harmful to our health

Let’s have a closer look at Ventilation and Filtration, 2 components directly linked to improved Indoor Air Quality.


Ventilation systems ensure optimal climate conditions by providing a fresh, healthy and comfortable environment for buildings of all sizes and different applications. In a completely closed room in a building, air cannot easily enter/leave the room, causing air pollutants to remain and accumulate in the room. This could impact the health of people in the room. Ventilation is essential for diluting and removing these air pollutants.

well-maintained ventilation system and adequate air exchange rate have been demonstrated to be an effective solution to protect people from contaminants, including viruses.



Virus particles can piggyback on larger dust particles or droplets and travel through a building. Infectious diseases can be controlled by interrupting the transmission routes used by a pathogen. Using high-efficiency air filters in air conditioning and ventilation systems can help to capture the majority of airborne particles, reduce the airborne concentration of bacteria and viruses and thus the risk of transmission through the air.

Air disinfection add-ons for filtration

With a good filtration system, you can capture very small Particle Matter from the airstream, but the captured viruses, bacteria and fungal organisms are not inactivated. They can still replicate and potentially cause diseases. In order to prevent this from happening air disinfection is needed.

Flash Streamer

Top air treatment through unique Flash Streamer technology

Daikin’s patented Flash Streamer technology inactivates more than 99.9% of the Novel Coronavirus (SARS-Cov-2). The massive streamer discharge hits the allergens and hazardous chemical substances, decomposing and fragmenting their surface proteins, which are then destroyed through oxidation. During the test, allergens were placed on the electrode of the streamer discharge unit and then photographed through an electron microscope after being irradiated.

Allergens photographed through an electron microscope after being irradiated.

(Testing organization: Yamagata University and Wakayama Medical University)

UV-C light

Ultraviolet energy inactivates viral, bacterial, and fungal organisms so they are unable to replicate and potentially cause disease. The entire UV spectrum is capable of inactivating microorganisms, but UV-C energy (wavelengths of 200 – 280 nm) provides the most germicidal effect.

Disinfection and sanitization through UV-C light are widely used in hospitals. UV-C light however is a health hazard to the human body. By treating recirculated & fresh air with UV-C light directly within the Air Handling Units, clean and microbe-free air can be achieved without exposing the human body to harmful UV light.

Disinfection through UV-C light in an air handling unit illustration.

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