Understanding Ultraviolet Light
Whether you’re looking to upgrade your HVAC system or needing help with eliminating mold, mildew or bacteria, ultraviolet or germicidal lights may be what you need. But how do they work?
Types of UV Light
Ultraviolet (UV) light is designed to produce UV radiation (a form of electromagnetic radiation) that comes from different places, the primary source being from the sun. They are measured in nanometers (nm) and are divided into three categories:
UVA—315-400 nm, long wave, not absorbed by the ozone layer (commonly called black light)
UVB—280-315 nm, medium wave, 95% are not absorbed by the ozone layer
UVC—100-280 nm, short wave, all absorbed by the ozone layer (referred to as germicidal)
UVB light is the main cause of sunburns and skin cancer. However, it is also the main source of vitamin D, which helps with bone development and helps the body absorb calcium. UVB and UVA lamps can be helpful in treating skin conditions, mood disorders and other health conditions.
UVC lamps are the main types of lamps used in tanning beds, and because of their short wavelength frequencies, they are germicidal, which means they can help eliminate germs and bacteria in the air, in water and on surfaces. They are used in UV air purification systems and can be used in HVAC systems to prevent mold buildup.
Using UV Light to Kill Mold and Bacteria
Mold is part of our natural environment; it is a fungus that is made up of small organisms that can be found everywhere, indoors and outdoors. Mold becomes a problem indoors when mold spores touch wet surfaces and grow as it can have a big impact on air quality in your home. Spores will enter the air and can be inhaled by anyone. The best way to control mold growth is to control moisture.
Because UV light has a higher frequency than regular light, it can be very effective at killing mold spores as well as disinfecting bacteria and viruses without needing to use any harsh chemicals. If you install a UV lamp in an HVAC system, it can block some molds from growing on the moist surfaces inside the unit, such as cooling coils, drain pans and ductwork.
UV light sends out short wavelengths of energy that penetrate mold. It breaks up the DNA inside to clean and eventually inactivate it. The effectiveness of the UV light depends on the length of time the mold is exposed to the light as well as the intensity you’re using; the higher the intensity, the more effective it will be at damaging the organism preventing it from reproducing.
Benefits of UV Lights in Your HVAC System
• Improves efficiency and airflow by cleaning the coils and the air that passes through your unit.
• Reduces energy costs: A cleaner unit means lower energy bills.
• Eliminates mold/mildew and kills bacteria by disinfecting moist edges and grooves with no toxic chemicals.
• Reduces odors, allergies, asthma and respiratory symptoms by providing an extra layer of protection.
• Improves indoor air quality by sanitizing the air before it’s circulated throughout your home.
Disadvantages of UV Lights
• They can be expensive to install (between $1,000-$2,000).
• They need regular maintenance (should be replaced every one to five years depending on the light).
• If installed improperly, they can damage your system.
• Potential safety hazards when exposed to the UV rays directly or indirectly.
• Effectiveness is limited because they can only kill germs that pass through its rays.
Can You Install a UV Light Yourself?
UV lights are safe and effective but are not considered a DIY job. They have to be installed properly into your HVAC system and can be damaging to your eyes or skin if exposed to their rays.
Lennox’ Healthy Climate® Induct Air Purifier remove contaminants like mold, mildew and bacteria by using maximum-intensity ultraviolet light, which improves the health of your equipment and protects your family members with allergies, asthma and other health-related conditions.
Consulting with a professional can help you make an informed decision about integrating UV technology into your HVAC system, ensuring a healthier living environment for you and your family. Book an appointment with your local Lennox Dealer to find the best indoor air quality solutions using UV lights.
