With tighter building construction in recent years, the quality of indoor air has declined dramatically.
The air circulating in the ductwork of the average home can be concentrated with contaminants including molds,pet dander, bacteria, viruses, and dust mites. We fill our lungs up to 20,000 times each day. Over time, these contaminants can cause inflammation of the mucous membranes, upper respiratory problems, asthmatic conditions, headaches, and flu-like symptoms.
Filtering systems offer little or no help because these airborne contaminants either pass through the filter or simply collect on the filter medium, creating a breeding ground. Now, with the ultraviolet devices, a solution is available to directly address the problems associated with poor indoor air quality.
The Sun: Nature’s Outdoor Air Purifier
For years, scientists have known that one of the most effective air purifiers is natural sunlight. Not the light we see when we look out the window, but the invisible “C” band, ultraviolet rays that make up part of the sun’s light spectrum.
The sun’s UV-C rays act as a natural outdoor air purification system, inhibiting the growth and reproduction of bacteria, viruses, fungi, molds, and dust mites. However, this natural process does not occur indoors. Ultraviolet radiation (UV-C) from our Ultraviolet devices replicates the natural outdoor purification system of the sun by destroying the illness and disease-causing microbes living and multiplying in indoor air. In combination with a air-filter, it is the most effective way to reduce airborne contaminants and the health risks they represent.
What Products We Recommend:
The UV-Aire unit is designed to emit powerful UVC Band light rays, which sterilize and reduce airborne microorganisms as they pass through a heating or air conditioning system. It is installed in the main supply or return duct and operates continuously to automatically purify the air in the home 24 hours a day.
- 24V Plug-in Transformer Included
- Compact Design Fits in tight spaces
- Built-In Safety Switch Designed to light only inside the duct
- E-Z Lamp Replacement Simple twist and lock
Sizing and Selecting Units:
Square Footage/UV-Aire (for ducts at least 16″ Wide)
Up to 2000 Sq/1 unit
4000 Sq/2 units
Lamp Replacement Part # 46511200
Single Pass Test: UV Deadly for Airborne Microbes
This study introduced a common bacterium into a galvanized air duct equipped with a UV light to determine how effective the lamp would be in reducing the bacteria with one exposure, or a “single pass.” The tests were conducted at two speeds: 1125 cfm and 2250 cfm in an 18″ x 18″ duct. The UV lamp yielded at least a 90% reduction of the test bacteria with a single airflow pass at 1125 cfm, and at least 71% reduction at 2250 cfm.
Cumulative Tests: Multiple Exposures Dramatically Improve IAQ
To further investigate the effectiveness of UV on indoor air quality, Microbe Management created a series of tests designed to measure the cumulative effect of UV in reducing airborne contaminants. The tests were performed in a structure with two isolated 8′ x 8′ x 8′ rooms where air could be sampled. In the control room, no UV was present, while the other room utilized a portable UV air purifier. According to Bernard Kane, Ph. D., of Microbe Management, “Test results were very encouraging. In both rooms, we introduced a resistant, spore-forming bacteria until the air was saturated with 350 colonies per cubic foot. In the room with the portable UV unit, the spore count was reduced by 50% in just 10 minutes and by 98% within 30 minutes. In the control room, without UV, more than 85% of the bacteria were still active after thirty minutes.” Similarly, the leading consumer UV “tower” model was also tested, but showed only minimal effectiveness. (See chart below.)
Conclusion: UV Is An Effective Part of “Whole House” Solution
A-coil irradiation, single pass, and cumulative tests confirm that UV is an important and effective contributor to a healthier home environment. UV technology used with a quality filter (MERV rated 8 or higher) will dramatically improve Indoor Air Quality. Additionally, portable units can be used in combination with in-duct models. This combination is strongly recommended for individuals with depressed immune systems, asthma, allergies, or other respiratory conditions. For homes without forced-air, portable UV air purifiers are recommended to enhance IAQ. Also, health care professionals, teachers, and day-care workers can benefit from additional UV protection from influenza and other viruses.