According to the NIOSH (National Institute for Occupational Safety & Health), it identifies some of the factors that have a huge impact on the effective usage of UV germicidal irradiation to prevent tuberculosis. Let us have a look at such factors as given below.

Does & Irradiance Of UVGI 

The main two factors that need to be considered at the very top include the dos of the UVGI as well as the sensitivity of the UVGI received from the microorganisms to kill all the microorganisms. The dose of UVGI in terms of irradiance can be acquired by multiplying exposure time. A well-designed and developed UVGI system may be highly effective in inactivating all airborne droplets that comprise mycobacteria if designed to provide an average fluency rate of UV. 

Mechanical Ventilation 

If the ventilation rate in a room is leveled up, then the total count of microorganisms removed through the UVGI system (ระบบ uvgi, which is a term in Thai) has also increased. But when there is a deployment of mechanical ventilation, then the effectiveness of this system may also get reduced as the bacteria’s residence time in the irradiated zone lowers down. Under the conditions of the lab with a ventilation rate of around six ACH, the rate seems to be additive with all systems of mechanical ventilation as killed or maybe inactivated in rooms. 

Air Mixing 

The system depends on the movement of the air between the upper portion of the room and the lower portion of the room when the droplet gets generated. When in the very upper portion, the droplet nuclei comprising of M. tuberculosis may get exposed to enough doses either to kill or to inactivate them. 

When the system got installed, then the general system of ventilation ought to be designed in a manner to give the patterns of airflow across the rooms and protect stagnation of air from diffusing supply to the exhausted grills. In addition to this, the heating as well as cooling seasons ought to be considered and the UVGI system is designed to offer the optimal movement of the air. 

Wrapping Up 

At the end of the factors associated with the UVGI system, we can consider all these factors that may leave a huge impact. These factors are highly important and everyone needs to keep a check on all these aspects of the system. These parameters should consider all the times.