Air purifiers or air purifiers are tools that remove contaminants from the air in the room. These devices are generally marketed as beneficial to allergy sufferers and asthmatics, and on reducing or eliminating secondhand tobacco smoke. Commercial graded air purifiers are produced either as stand-alone small units or larger units that can be attached to air handling units (AHUs) or HVAC units found in the medical, industrial, and commercial industries. Air purifiers can also be used in industry to remove impurities such as CO 2 from the air before being processed. Pressure swing adsorbers or other adsorption techniques are usually used for this.
Video Air purifier
History
In 1830, a patent was awarded to Charles Anthony Deane for a device consisting of a copper helmet with a flexible collar and collar. The long leather hose attached to the back of the helmet will be used to supply air, the original concept is that it will be pumped using a double bellows. A short pipe allows breathing air to escape. The clothes should be made of leather or an airtight fabric, secured with a rope.
In the 1860s, John Stenhouse proposed two patents applying the charcoal absorbing properties to air purification (patents July 19, 1860 and May 21, 1867), thus creating the first practical respirator.
Several years later, John Tyndall found an improvement on the fire-fighting respirator, a hood filtering out toxic fumes and gases from the air (1871, 1874).
In 1950, HEPA filters were commercialized as highly efficient air filters, after use in 1940 at the United States Manhattan Project to control radioactive contaminants in the air.
Maps Air purifier
Use and benefit of the purifier
Dust, pollen, pet dander, mold spores, and dust mite droppings can act as allergens, triggering allergies in sensitive people. Smoke particles and volatile organic compounds (VOCs) can pose health risks. Exposure to various components such as VOC increases the likelihood of experiencing symptoms of sick building syndrome.
Purification Technique
There are two types of air purifying technology, Active and Passive. The active air purifier uses ionisation to clear the air. Passive air purification units on the other hand use air filters to remove pollutants. They are more efficient because all the dust and Particulate Matter are permanently removed from the air and collected in the filter.
Other aspects of air purifiers are harmful gas byproducts, noise levels, filter change frequency, electricity consumption, and visual appeal. Typical ozone production for air-ionizing cleaners. Although high concentrations of harmful ozone, most ionizing air produce a low amount (& lt; 0.05 ppm). The noise level of the purifier can be obtained through the customer service department and is usually reported in decibels (dB). Noise levels for most refrigerators are low compared to many other home appliances. The frequency of filter change and electricity consumption is the primary operating cost for each cleaner. There are many types of filters; some can be cleaned with water, by hand or with a vacuum cleaner, while others need to be replaced every few months or years. In the United States, some purifiers are certified as Energy Star and energy efficient.
HEPA technology is used in portable air purifiers because it eliminates common airborne allergens. The US Department of Energy has requirements manufacturers need to pass to meet HEPA requirements. The HEPA specification requires the removal of at least 99.97% of air pollutants 0.3 micrometers. Products claiming "HEPA-type", "HEPA-like", or "99% HEPA" do not meet these requirements and may not be tested in independent laboratories.
Air purifiers can be assessed on a variety of factors, including the Clean Air Delivery Rate (which determines how well air has been purified); efficient area coverage; hourly air changes; energy use; and filter replacement cost. Two other important factors to consider are the length of the filter that is expected to last (measured in months or years) and the resulting noise (measured in decibels) by various settings that the purifier executes. This information is available from most manufacturers.
Potential ozone hazard
Like other health-related equipment, there is controversy surrounding claims from certain companies, especially those involving ionic air purifiers. Many air purifiers produce some ozone, an energy allotrope of three oxygen atoms, and in the presence of moisture, a small amount of NO x . Due to the nature of the ionization process, ionic air purifiers tend to produce the most ozone. This is a serious problem, because ozone is an air pollution criteria regulated by federal and US federal standards. In controlled trials, in many cases, the concentration of ozone is above the level of public and/or industrial security set by the US Environmental Protection Agency, especially in poorly ventilated rooms.
Ozone can damage the lungs, causing chest pain, coughing, shortness of breath and throat irritation. It can also aggravate chronic respiratory diseases such as asthma and compromise with the body's ability to fight respiratory infections - even in healthy people. People who suffer from asthma and allergies are most vulnerable to the adverse effects of high levels of ozone. For example, increasing the concentration of ozone to unsafe levels may increase the risk of asthma attacks.
Due to below-average performance and potential health risks, Consumer Reports has advised against using ozone-producing air purifiers. IQAir, an educational partner of the American Lung Association, has become the industry's leading voice against ozone-producing air purifier technology.
The ozone generator used for shock treatments (vacant rooms) required by smelter contractors, molds, and smelter repairs as well as cleaning companies of crime scene to oxidize and permanently remove smoke, mold and odor are considered as valuable and effective tools when used properly for commercial and industrial purposes. However, there is growing evidence that these machines can produce unwanted byproducts.
In September 2007, the California Air Resources Board announced a ban on an indoor air purifier that generates ozone above the legal limit. This law, which came into force in 2010, requires testing and certification of all types of indoor air purifiers to verify that they do not emit excessive ozone.
See also
- Air filter
- Water ioniser
- Air purifier
- Electrostatic precipitators
- HEPA
- Nose filter
- NASA Clean Air Study
- Ozone generator
References
External links
- CADR.org Information on Clean Air Delivery Rates by AHAM
- EPA report on indoor air quality
- DOE HEPA Filter Standards HEPA filter specifications for DOE contractors
- Potera, C. (2011), Wood Burning Stove Getting Help from HEPA Filtering the US National Institutes of Health
Source of the article : Wikipedia
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