CAUTION: Germicidal ultraviolet rays are harmful to skin and eyes. Always wear protective clothing and eye shield (goggles, glasses, etc.) when working with direct ultraviolet radiation.
What air fixtures can be used for my commercial/industrial application?
These units can be viewed at: Air & Surface Disinfection Equipment
Can germicidal ultraviolet penetrate unopened mail?
No, germicidal ultraviolet will sanitize only exposed surfaces. The mail piece will need to be turned over so that both sides of the envelope can be sanitized and note that proper precautions should be taken so that personnel are not exposed to the ultraviolet rays. An example of a safe application would be a germicidal ultraviolet fixture installed in an enclosed box with an interlock safety switch that prevents operation of the lamp when the box is open.
Can germicidal ultraviolet be used to disinfect keyboards, phones, computer mice etc.?
Yes. Exposed solid surfaces of many devices may be sanitized by germicidal ultraviolet radiation. Please keep in mind that disinfection does not take place on internal components and surfaces. Proper precautions should be taken so that personnel will not be exposed to the germicidal ultraviolet rays. Bear in mind that some materials and plastics may degrade when repeatedly exposed to intense or prolonged ultraviolet exposure.
Are plants, food, clothing, plastics affected by ultraviolet?
Users of germicidal ultraviolet lamps should be aware that short wave ultraviolet energy can sometimes fade colors or alter the surface of some materials. Living plants, leafy vegetables and some food items are adversely affected by direct exposure to short wave ultraviolet radiation. Many plastics and rubber material can degrade under extended exposure to ultraviolet rays. Questions concerning the compatibility or suitability of materials can usually be answered by exposure testing of a small sample. If you need help in determining the ultraviolet resistance of any material, please contact our office.
Will a germicidal ultraviolet lamp and fixture installed in my home and/or office offer protection against airborne bacteria, mold and virus?
Yes – the installation of a germicidal ultraviolet fixture in your home and/or office will inactivate bacteria and other microorganisms in the air. There are numerous types of ultraviolet air purifiers available. Ultraviolet units can be installed in new or existing air duct systems already in place at your home or office (Aerologic®), forced air units with fans and filters can disinfect the air in enclosed spaces (Sanitaire®), or louvered fixtures can be installed to irradiate upper room air in occupied spaces (Hygeaire®) (often specified in healthcare settings).
What are the limitations to the use of germicidal ultraviolet for air and surface disinfection?
A) Germicidal Ultraviolet rays cause harmful irritation to skin and eyes. Always wear protective clothing, gloves and eye shield (goggles, glasses, etc.) when working with direct ultraviolet radiation. Normal tightly woven clothing will often times provide adequate protection.
B) Microorganisms suspended in air or water are susceptible to germicidal ultraviolet radiation. However, germicidal ultraviolet will not penetrate most ordinary materials such as cloth, paper, ordinary glass and most plastics. Therefore, any surface or item that needs to be exposed to germicidal ultraviolet should have a direct uninterrupted path to the rays of the germicidal ultraviolet lamp.
What distance and how long would I have to expose an article to germicidal ultraviolet to sanitize it?
The exposure necessary to inactivate microorganisms is a product of time and ultraviolet intensity. High intensities for a short period of time, or low intensities for a long period of time are fundamentally equal in lethal action on infectious microorganisms. As a rule of thumb, at two inches away from the STER-L-RAY ® germicidal ultraviolet lamp, most common bacteria and virus are inactivated within five seconds of exposure. For specific recommendations, please call our staff with the details of your application (including area available for the fixture, how far the fixture will be from the article, etc.) The more information you can provide, the better.
How do I size a Sanitaire® unit?
To treat areas that are well ventilated, we recommend selection of a Sanitaire® Room Air Sanitizer that will yield a minimum of (3) equivalent room air changes per hour. In areas that are poorly ventilated and areas that present a higher than usual risk of airborne infection (such as a crowded waiting room), installation of Sanitaire® Room Air Sanitizer(s) capable of six room air changes per hour is recommended. See our catalog or contact our office to discuss the specifics of your application and get a recommendation.