Sep 18, 2021
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How to Remove Airborne Pathogens from HVAC System

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Ventilation and Filtration

Changes to HVAC system, in buildings like corporate sectors, educational sectors, other high-traffic areas, increased filtration techniques, can lower the risk of airborne viruses. You need to change the filter frequently and also get your unit checked by  heating & cooling expert bi-annually to ensure that system runs smoothly and efficiently.

How to Remove Airborne Pathogens

(IAQ) defined as indoor air quality that have a remarkable effect on the people’s health as they spend approximately 90% of their time in closed places. The ventilation effectiveness is the measuring parameter for the quality of air supplied through a HVAC system. The filtration system in HVAC system removes pollutants via introducing fresh, unpolluted air and remove polluted air. The pollutant removal of an inner space can improve IAQ of a space. the pollutants can be removed through the processes as under.

  • Filtration removes the pollutants concentration
  • Increasing air change rate, particularly with filtered outside air.
  • Improving ventilation efficiency through well-established ventilation architecture

Below are some best suitable and cost-effective solutions to improve IAQ.

Integrated Filtration

This simple solution replaces current diffusers to filter and eliminate virus particles more than 90 percent. Filtration efficiently minimizes the airborne contaminants concentration at each diffuser, lowering germs and virus’s infection risk in the air. There is a low upgrading cost for this standard system is only a minor change to the installed HVAC system. These products are utilized practically in any environment.

1: Retrofitting the Existing Diffusers

They consist of a filter and a diffuser of secondary nature positioned directly beneath existing diffusers. This attachment in between the original diffuser and T-bar ceiling grid drives air through a filter before. These attachments project 15cm from ceiling, serving as an indicator of the extra steps required to ensure clean air. Filters can be accessed by sliding inner or outer access panel.

2: Replacing Diffusers with Integrated Ceiling-Access Filters

Diffusers mounted at the top of T-bar ceiling grid, with ceiling-access filters to replace the existing diffusers. For periodic replacement, these diffusers with integrated filters needs access to the roof. These filters can be accessed by sliding inside or outside through a hanged access door outside the unit.

3: Installing Room-Side Accessible Filter

The replacing diffusers with filters that can be accessible from room side are top of the T-bar roof grid have a 15cm plenum box. Room-side changeable filters allow easy access to the filter for filter replacement periodically. These filters use a sharp edge flange and a gel seal to create a reliable seal.

To produce a reliable seal, these filters use a gel seal. Filters available removes at least 95% of viral particles.

Displacement Supply

Within the zone, these solutions use present ducted system. Displacement ventilation produces air at low velocity and high temperatures. This energy efficient technique uses convection mechanism. As the air pushes contaminants outside of the respiratory zone instead of recycling.

 1: Ceiling Displacement

In an existing ceiling grid, DFC displacement diffuser is mounted to remove existing supply grille. The present ducting system and terminal units are utilized to minimize the overall costs regarding renovation.

2: Ceiling Displacement with fan mixing box

The addition of a fan mixing box to an existing ductwork system exchanges the VAV terminal unit and improves the rerouted air filtering process. The FDC blends return air to provide a supply air temperature of 17°C.

 3: Low Level Displacement with Fan Mixing Box

Present ducting can be redirected and linked to the DCC from the ceiling. This low-level supply enhances ventilation efficiency, smooth airflow, and air distribution for occupants.

Supplementary Filtration

These devices are a cost-effective way to improve air filtration. Filtered exhaust booster units are a brilliant platform to filter circulating air without replacing your air supervisor. Retrofit fan-powered filtration systems are easy to install and they do no net any amendments to the present air distribution system.

1: Filtered Exhaust Booster

The booster system is designed to give filtration to exhaust air before it returns to the air handler with no additional pressure drop into existing ductwork. The unit has a built-in fan that adjusts for filter pressure decrease in order to maintain zero pressure drop. If your central air handler won’t accept a higher-rated filter, this is the best option.

2: Overhead Air Filtration Unit

The main objective is the room air filtration via consistent air changes. The fan powered unit ejects air via MERV filters directly, and discharges the unpolluted air. This unit does not need modification to existing ducting system or HVAC equipment. They can be mounted in a T-Bar ceiling or a visible ductwork layout. As it can pair perfectly with any diffusers. It is suitable for any location that requires increased air filtration.

Occupant Wellness Through Stratified Air Systems

Within an occupied zone, SAS improves the indoor air quality by delivering air directly into the zone breath in and pushing contaminants out of the space. Reconfiguration costs and time can be saved by underfloor service. Underfloor Air Distribution (UFAD) is a substitute to conventional overhead air circulation. UFAD makes use of the natural resilience of air to eradicate heat and impurities. Displacement Ventilation works in the same way as UFAD does, delivering air directly into the inhabited zone and causing stratification. Diffusers are most commonly ducted from the ceiling to a low-level supply diffuser. Ceiling diffusers can be utilized to floor space in some circumstances.

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