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They get dirty and restrict the air flow.
All of them
No you need not adopt the unique furnaces, but that doesn't necessarily mean that you had best actually undergo with it once. Furnace Filters, Air Conditioning Filters at Air Sponge Filter Company
It is important to change the filters on your pitchers regularly. On average your filters should be changed about every 40 gallons or roughly 2 months.
That will depend entirely upon the type of furnace you have. There are filter less furnaces, so if you have one, you won't need filters. Otherwise, if your furnace requires a filter, you will need to purchase filters and replace them regularly. If you have the owners manual, that will tell you if the furnace needs a filter.
Change oil and filters regularly
Aprilaire makes high quality MERV 10 rated filters for more than two dozen different air cleaners and furnaces.
At an auto mall, everything related to automobiles is sold. You can purchase windshield wipers, oil filters, air filters, headlights, transmissions, brakes, and more.
Carroll E Ball has written: 'Pilot demonstration of magnetic filtration with continuous media regeneration' -- subject(s): Electric furnaces, Environmental aspects, Environmental aspects of Electric furnaces, Filters and filtration
Examples: glassware, plastic ware, balances, ovens, furnaces, tongs, tripods, filters, hot plates and many others.
Honeywell Furnace Filters are used in furnaces for improving indoor air quality. A hot furnace dries out the air and a filter keeps out the dust and grime from entering the house through the furnace.
The filters in an air purifier ususally need to be changed around every 3 - 6 months but it also depends greatly on what kind of air purifier you have .