Reduce your air conditioning costs with us!


Article By MG Cooling Solutions In UVGI - April 20, 2021

Healthcare facilities are the lifeline of any country as they are responsible for treating highly infected and contagious patients. Hospitals are mostly subjected to microbiological airborne hazards that can cause contaminations in both patients and workers. Hospital-acquired or nosocomial infections have been a persistent problem in hospitals, nosocomial infections also known as healthcare-acquired infections (HAI’s) is the 4th leading cause of death and approx. 1 out of 25 patients acquires an infection during a hospital stay. Studies have shown that nearly everything- surfaces, airborne particles, healthcare workers’ hands, medical equipment, and all in between can serve as a reservoir and a vector for pathogens, viruses, and bacteria. Poor hand hygiene and surface contaminations can also be a reason for transmission, air, and water supply systems can also transmit pathogens. Aspergillus and pseudomonas aeruginosa, are some common pathogens found on the cooling coils in AHU, which can contaminate the moving air stream through the hospital ducts. Various viruses, bacteria, and fungi that can cause tuberculosis, influenza or other respiratory diseases can be brought from outside contaminated air into the air stream or recirculated air from infected spaces. Legionella, cryptosporidium, mycobacteria, giardia, etc can be found in cooling towers and water supplies

It is very important to apply every available technology to protect every occupant inside healthcare facilities. UVGI is one such technology that can inactive airborne infectious agents to protect the health of occupants inside building. Nearly 60% of all UVGI air disinfection systems are applied in healthcare facilities as they can be used for terminal cleaning of patient rooms, isolation rooms, and operating rooms. Ultraviolet germicidal irradiation (UVGI) makes use of short-wavelength ultraviolet (UV-C) having germicidal properties to kill microorganisms present inside the indoor environment of healthcare facilities. Application of UVGI in a healthcare facility is the following that requires a completely different approach and amount of ultraviolet energy


HVAC systems serve as an excellent setting for surfaces that support the growth of microorganisms in and around the cooling coils, drains pans, plenum walls, and air filters. Maintaining a sterile environment in hospitals is very crucial for patients with weak immune systems due to cancer or AIDS. UVGI can eliminate 99.9% of microbial contaminations to improve indoor air quality. Cooling coils will be irradiated 24/7, high UV intensities are not required and all the components and surfaces will be fully disinfected in UV light


Centers for disease control (CDC) recommend the use of UVGI to reduce the transmission of airborne bacterial and viral infections in hospitals. Two systems of UVGI that can be used are-

Duct irradiation: in this UV lamps are placed inside the ducts of AHU to disinfect the outside or recirculated air from inside the facility. To disinfect moving air higher intensity UV is required due to short residence time

Upper air irradiation: in this UVGI lamps are generally mounted above the occupant’s level approx. above 8 feet. It is designed to irradiate the upper air in a room through convective air currents. The upper room UVGI air irradiation can be used: – to inactive tubercle bacilli in TB ward, in isolation or treatment rooms, waiting rooms, emergency rooms, corridors, and other central areas where patients with undiagnosed infections could contaminate the air



Healthcare-associated pathogens can be easily transmitted through environmental surfaces. Portable UV-C devices are becoming popular to decontaminate rooms that will result in a reduction in HAI rates. All common touch surfaces should be exposed to UV light to kill all the microorganism, this may require more than one placement of the UV devices in an area


Sterilization using UV-C in operating rooms can be achieved in two steps

  1. Before the operating room is occupied, it is completely irradiated with direct UV-C fixtures that will sterilize all the surfaces
  2. Irradiation of the air inside the operating room with indirect germicidal fixtures to ensure a sterile environment so that the transfer of pathogenic or toxic microorganism through the air can be eliminated

Four factors will determine the efficacy of UVGI devices

  1. Distance between the UVGI lamp and the pathogen
  2. The intensity of the UVGI Lamps
  3. Duration of exposure to the UVGI lamps
  4. Design of the device

Benefits of using UVGI in hospitals;

  1. There will be a reduction in patient and staff medical expenditure because of nosocomial infections and operating room infections
  2. There will be a reduction in routine maintenance costs for cleaning of ducts and coils
  3. It will improve HVAC efficiency resulting in energy saving and extended system’s life

In the time of pandemic UVGI system can be a blessing for healthcare facilities and MG Cooling solutions a leading HVAC enterprise is increasing its dimensions in air purification methods. Our skilled engineers will provide easy installation for your facility so that you will get the maximum benefit of UVGI for your facility  

Related Posts

Added to UVGI

July 2, 2021

 Airborne infections are carried by microorganisms like bacteria, fungi and viruses that are invisible to..


Added to UVGI

June 24, 2021

Our health and well-being are profoundly affected by the quality of the air we breathe,..

MG Cooling Systems Signup

Get the latest of all Green Building, Environment, Sustainability news and articles.