Contamination Control

Clean room filtration, HEPA filters and Air cleaners

    In emergency situations, such as outbreaks of life-threatening diseases, epidemics or even pandemics, urgent action must be taken to inhibit the spread of the disease and its transmitters.

    Products, Solutions & Applications

    Facility Management

    How Facilities Managers can utilize HVAC to help mitigate the risk

    Airborne transmission mostly occurs in indoor environments where people spend over 90% of their time. Increasing ventilation rate (Air Change Rate - ACR) is believed to reduce the cross infection of airborne transmitted diseases by removing or diluting pathogenladen airborne droplet nuclei. Find out more

    HEPA Filters

    HEPA (High Effciency Particulate Air) filters are used for airborne contamination control and are classified H13 or H14 according to the EN 1822 standard. These ratings guarantee a removal effciency of 99.95% (H13) or 99.995% (H14) of the most penetrating particle size (MPPS), typically in the size range of 0.1 µm – around the size of many types of viruses.

    HEPA filters are used for a wide range of different applications, but typically focus on serving three broad purposes:

      To create a clean environment inside a room by removing harmful or dangerous particulate from the incoming air flow.
      To ensure that the air leaving a room is clean and safe, and does not pose a threat to the wider environment.
      To prevent the spread of contamination through the ventilation system.

    For detailled information on our High Efficiency Air Filters see:

    Pressure cascades - the Invisible Walls

    The term "invisible walls" does sound somewhat strange when speaking in the context of air filtration, but when taking a closer look, it all comes down to a simple principle: creating air pressure cascades.

    But what are pressure cascades and what are they used for?

    There are two different options for pressure cascades depending on the use case. You can keep a room under either positive or negative pressure in comparison to its surrounding environment, e.g. a hallway. Logically, air always moves from higher pressure areas to lower pressure areas. Find out more

    Emergency Isolation Rooms

    High effciency (HEPA) air filters are used to create isolation rooms and ensure that contaminated air cannot reach the wider environment. Do you want to know how HEPA filters should be employed, how to handle high effciency filters, and what you need to consider when modifying the ventilation system to enable their installation?
    Find out more

    TRI-KLEEN 400UV (only available in the US/Canada)

    Studies have shown that while coronavirus, SARS-CoV-2, is typically transmitted through respiratory droplets (coughs & sneezes), the virus may remain suspended in the air for hours. Tri-Dim’s portable TRI-KLEEN 400UV unit can provide negative pressure to support the removal of harmful contaminants, such as e. g. viruses from an airborne state, through the use of HEPA filtration and UV lights. 

    Tri-Dim website >>

    Contact us for more information!

    What can you do against COVID-19?

    Personal hygiene and distance (>2 m) from sick people is important, but an effective prevention strategy should include several or all of the following:


    Use HEPA FILTRATION to catch all airborne droplet nuclei

    • HEPA filters are tested and rated by their performance at retaining particles at the most penetrating particle size (MPPS) i. e. 99.95% for H13 HEPAs and 99.995% for H14 acc. to EN 1822.
    • This means that HEPA filters will remove any solid or liquid particle from the air with an efficiency of at least 99.95 %

    • Viruses like SARS-CoV-2 also often attach themselves to larger particles well within the focus of HEPA filters.
    • HEPA filtration should be a key part of your infec­­tion control strategy if it’s appropriate to your building.

    Use PORTABLE AIR cleaners

    • they can provide additional air cleaning capabilities for buildings without any high efficiency filtration system
    • Make sure to use high quality products with good filters. Low quality air cleaners can do more harm than good by creating a turbulent air flow while contributing little cleaning power
    • dilution with fresh air should still be prioritized
    • place the device as close as possible to your location, so you breathe the actual filtered air. The larger the distance to the AP, the higher the chance to inhale swirling contaminants which could include viruses.
    • Activated carbon stage can remove hazardous gases released by cleaning agents (avoiding side effects from additional cleaning activity).

    Increase efficiency with­out sacrificing air flow

    • increasing dilution with fresh outside air is most important
    • use the same filter classes as generally recommended (e.g. at least ISO ePM1 50% with an ISO ePM10 pre-filter stage)
    • maintain normal filter change intervals
    • disable air re-circulation entirely or reduce it to a minimum
    • if necessary increase fresh air dilution by frequently opening windows
    • higher energy consumption should not be the main concern during these times

    Personal Protec­tive Equipment

    for healthcare and maintenance workers i.e. glasses, gloves, respirators, masks and clothing


    Control air-flow patterns

    move droplet nuclei out of breathing zones


    Isolation Rooms

    In healthcare facilities, suspected or confirmed coronavirus patients should be placed in airborne infection isolation rooms with a negative pressure and appropriate HEPA or above filtration on the recirculation or exhaust air flows.


    Identify possible exhaust re-entrainment

    of contaminated air i. e. exhaust too close to HVAC air intakes


    Filter Maintenance and removal

    Check that all filters are operating effectively. And, when it’s time to change filters, take care not to release any viruses
    that have collected on the filter media into the internal environment – remembering that SARS-CoV-2 can survive for up to several days on surfaces. Dispose of any contaminated waste according to the guidelines in your location.


    Information for download

    General Information

    What is COVID-19?

    The coronavirus, SARS-CoV-2, has certainly grabbed the attention of the world, governments and financial markets. Let's take a look at what the virus is, how it is spread and what we can do to help control the virus. For latest information and warnings you can check the World Health Organization and other relevant authorities to keep abreast.


    COVID-19 is a respiratory disease. Much of what is currently known about it and how it spreads is based on what we know about similar viruses.

    How does SARS-CoV-2 spread?

    Recommendations for the home office
    Hygiene recommendations
    Share & care!
    Social Distancing

    Reducing the spread of COVID-19 by social distancing


    Contact us for more information!