air purifiers replacement filters

I need info on the best air filters!?

I was wondering how a HEPA air filter works (not down at the molecular level but if you're supposed to plug it in somewhere and let it work it's magic). Also if you need to buy replacement filters or if you just need to clean it every couple of days and etc.

I have been using a Hepa air purifier in my home for going on 3 years now. It has worked great with little maintenance. It has a built in filter monitor that goes from green to red. It has a prefilter element that needs to be rinsed out in cold water every couple of months. The main filter lasts at least a year at a time , and only needs to be replaced when the monitor reaches red, indicating the need for a new one. It's been worth the money, and little time needed for its' benefits. Find a place, plug it in, let it work.
Sorry I do not know about the Oreck. I hope this helps.
NOTE: ginny is wrong, they are stand alone units, but some are integrated into other systems such as heating units. You can find them at all major retailers , RE: Walmart, Sears, Target, etc...

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Honeywell HRF-AP1 Universal Carbon Pre-Filter $5.25 Helps reduce common household odors. In addition, helps maximize the HEPA filter life. Should be replaced approximately every 3 months. Filter Type: Carbon; Filtration Type: Pre-Filter; Filtration For: N/A; Width: 8.27 in....

Filtrete Replacement Filter for Office Air Cleaner OAC100, 7.04 Inches x 9.37 Inches x 2.244 Inches (OAC100RF) $21.99 3M MA220M Desk Mount Easy Adjustable Arm For Dual LCD Monitor MA220MB 696...