ULTRAVIOLET (UV) AIR CLEANING UNITS
EnviTec’s Air Duct Disinfection Systems utilize germicidal UV lamps to protect personnel from potentially harmful airborne contaminants by effectively destroying airborne microbes, including bacteria and viruses in new or existing duct systems. Desired bacteria kill rates of 90% for the average commercial installation or 98% kill rates (essential for hospitals and pharmaceutical laboratories) can be achieved using these type fixtures.
Ultraviolet disinfection is a unique and rapid method of air and surface disinfection, utilizing germicidal ultraviolet lamps to produce short wave ultraviolet energy that is lethal to bacteria, virus and other microorganisms. By utilizing the EnviTec Air Duct Disinfection system the growth of bacteria, mold, etc. and the spread of cold and flu viruses as well as other airborne transmitted diseases is significantly reduced or eliminated completely.
The versatility of the EnviTec Air Duct Disinfection system allows it to be installed in either the return air plenum (where air temperatures are usually warmer) or the supply air plenum (where air speeds are lower). The UV unit should be installed in the middle of long, straight sections of duct to maximize the ultraviolet exposure time.
Principle of Operation
The EnviTec line of Air Duct Purification systems has been carefully conceived to provide germicidal ultraviolet exposure for air stream and surface disinfection. The dosage, as it applies to ultraviolet disinfection, is a function of time and the intensity of ultraviolet radiation to which the air stream and surface is exposed.Ultraviolet light is electromagnetic radiation with wavelengths shorter than visible light. UV can be separated into various ranges, with short range UV (UVC) considered "germicidal UV.” At certain wavelengths UV is mutagenic to bacteria, viruses and other micro-organisms. At a wavelength of 2,537 Angstroms (254 nm) UV will break the molecular bonds within micro-organismal DNA thereby destroying them or prohibiting growth and reproduction.
Exposure comes from germicidal lamps that emit germicidal UV electromagnetic radiation at the correct wavelength, thus irradiating the environment. The forced flow of air through this environment ensures the exposure.
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