It is very important for people who suffer allergies and those with babies or elderly invalids at home to invest in an air purifier. For an air purifier to work well it has to a high clean air delivery rating (CADR). It is expressed in terms of cubic feet per minute; so that a 500 CADR means that the filter can release 500ft3 of clean air per minute.
Air purifiers use different means to clean the air. Some techniques are more effective against some pollutants than others. Here are some of them. Air purifiers commonly use filters to remove particles in the air. A purifier with an HEPA (high efficiency particle air filter) sign means that it can remove even the smallest particles. Be aware that HEPA enabled devices need to remove 99.97 % of particles and nothing less otherwise it may not be an accurate representation of what you are looking for. If the ad says HEPA-like or HEPA-type then it may not be hat you should be buying.
Other filters use carbon. Carbon is highly porous and can absorb chemical in the smallest forms that is why it is good for filtering water. It can be used together with an HEPA filter. Some other filters use ultra violet light. In...
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