There is quite an array of pleated filters on the market right now. Most HVAC contractors will provide a good cost effective choice with their maintenance agreements. A 1" pleated filter with spun media is what one would see most of the time for residential use. The pleated design allows more surface area for particles to be trapped on and allows for a tighter weave of material. These filters are said to allow for 90 days between changing--however if there is massive amounts of large particles the filters will clog and diminish air flow quite rapidly. Make sure you check the filter if there is any construction, roadwork, or extreme dust conditions around the house.
Next time: washable filters.
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