I just had one installed which is 20x20x5". It supposedly should be changed once a year. Air Force 1 installed it along with an air filtration unit. For the price I paid I got ripped off for these 2 items. You can get the filters at Home Depot. I read somewhere that you have to be careful with the size of the unit in that the size I need I can purchase but it may not be the exact dimensions that I have even though it might say it's that size. Can't remember where I read that.
John
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Neptune, NJ 1963-2005
The Villages 2005-forever
"Don't curse the darkness when you can light a candle"
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