Air purifier An air purifier or air cleaner

Air purifier An air purifier or air cleaner is a device which removes contaminants from the air in a room. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke. The commercially graded air purifiers are manufactured as either small stand-alone units or larger units that can be affixed to an air handler unit (AHU) or to an HVAC unit found in the medical, industrial, and commercial industries. Air purifiers may also be used in industry to remove impurities such as CO 2 from air before processing. Pressure swing adsorbers or other adsorption techniques are typically used for this.

Use and benefits of purifiers Dust, pollen, pet dander, mold spores, and dust mite feces can act as allergens, triggering allergies in sensitive people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. Exposure to various components such as VOCs increases the likelihood of experiencing symptoms of sick building syndrome. Air purifiers are becoming increasingly capable of eliminating a greater number of bacterial, virus, and DNA damaging particulates through the use of ultra violet lighting technology. Air purification methods are used to improve the indoor air quality in home environments for people who have asthma or cardiopulmonary ailments, and in hospital environments, where air quality is susceptible to easily transmittable bacteria and other contagions.

HEPA Methods. HEPA filters are composed of a mat of randomly arranged fibres. The fibres are typically composed of fiberglass and possess diameters between 0. 5 and 2. 0 micrometers. Key factors affecting its functions are fibre diameter, filter thickness, and face velocity. The air space between HEPA filter fibres is typically much greater than 0. 3 μm. The common assumption that a HEPA filter acts like a sieve where particles smaller than the largest opening can pass through is incorrect and impractical. Unlike membrane filters at this pore size, where particles as wide as the largest opening or distance between fibres can not pass in between them at all, HEPA filters are designed to target much smaller pollutants and particles.

Safety. HEPA filtration works by mechanical means unlike the ionic and ozone filtration which use negative ions and ozone gas respectively. So, the chances of potential pulmonary sideeffects like asthma and allergies is a much lower with HEPA purifiers.

Biomedical applications. HEPA filters are critical in the prevention of the spread of airborne bacterial and viral organisms and, therefore, infection. Typically, medicaluse HEPA filtration systems also incorporate high-energy ultra-violet light units to kill off the live bacteria and viruses trapped by the filter media. Some of the best-rated HEPA units have an efficiency rating of 99. 995%, which assures a very high level of protection against airborne diseasetransmission.

A portable HEPA filtration unit used to clean air after a fire, or during manufacturing processes.