How Do UV Light Indoor Air Quality Products Work?

It’s becoming increasingly common to find UV light systems included in commercial and residential HVAC systems. UV light has been used as a disinfectant since 1908 and is still used in laboratories and hospitals to help disinfect equipment and surfaces. When included in an HVAC system, UV light can help those systems purify the air. What Is UV Light? Light is electromagnetic radiation with a vast range of wavelengths, only a tiny amount of which is visible to the human eye. Infrared light waves are too big for our eyes to detect, while UV light waves are much too small for our eyes to see. Most UV light is trapped in the upper atmosphere, in the ozone layer, and never reaches the planet’s surface. How Does UV Light Disinfect? The UV light that does reach us we notice as sunburns. UV light waves are small enough to damage cells. Specifically, the DNA strands inside of cells, killing them or making them inert. Single-cell organisms such as bacteria have no defense against UV light, and once the bacteria’s DNA is damaged, the organism will become inert. UV-Light and HVAC Systems While a UV light system won’t kill 100% of the microorganisms...

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