lab 2 summary - works by having two metal plates in the...

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Fitz Maro Byan Keelon and Laura Taylor September 18, 2007 Lab Summary This past week we participated in a web activity that dealt with the air around us, and issues that are affecting it. My group chose to do our research on the topic of air purifiers in homes. Although there are many different kinds of purifiers, we focused on the most popular two that are used in homes today. The first kind of purifier is one with a HEPA (high efficient particulate air) filter. This HEPA filter, one of the most common filter types, cleans the air by using layers of material that sort out all particulate matter smaller than 0.3 μ m. These kind of filters are helpful in keeping your home clean of the smaller and more dangerous particulate matter (like those that we learned about in class). The downside to having a HEPA filter is that the actual filters themselves must be replaced quite frequently to maintain its efficiency. The other kind of popular filter we researched was the ionizing purifier. This
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Unformatted text preview: works by having two metal plates in the filter, one negatively charged, the other positively charged. When larger molecules (like dust and dirt) pass through the filter, molecules are attracted to either one of the plates, and eventually will stick to the plates. This purifier requires no filters, but does need a quick wipe down with a cloth about once a week to keep the charged metal plates clean. Air purifiers have received a lot of flack from many different agencies, such as Consumer Reports, and even the EPA. Some filters make claims that are not substantiated by legitimate testing or evidence. Also, many people claim that some filters emit too much ozone, a molecule made up of three oxygen atoms bonded together, in a home. No matter what your stance on the filters, the fact remains that they are helping keep many homes free of dust, dirt and allergens. As technology progresses, the power and efficiency of the filters will only get better....
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lab 2 summary - works by having two metal plates in the...

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