High Quality Filtration by Flanders Precision-Aire (Precision Aire) Save Money with Our discounted 4 packs and Wholesale Case Quantities. Now Carrting the Most Popular Sizes of Furnace Filters including: 16X20X1, 16X25X1, 20X20X1, 20X25X1, 16 X 20 X 1, 16 X 25 X 1, 20 X 20 X 1, 20 X 25 X 1 Furnace Filter Air Cleaner Filter 16x20x1 for Honeywell, Carrier, Lennox, JUST $4.09 each when you order 4 $6.99, 4/$16.37 Furnace Filter Air Cleaner Filter 16x20x1 for Honeywell, Carrier, Lennox, JUST $3.58 each in case of 12 $42.93 Furnace Filter Air Cleaner Filter 16x25x1 for Honeywell, Carrier, Lennox, JUST $5.23 each when you order 4 $6.99, 4/$20.91 Furnace Filter Air Cleaner Filter 16x25x1 for Honeywell, Carrier, Lennox JUST $4.21 each in case of 12 $50.55 Furnace Filter Air Cleaner Filter Media 20x20x1 for Honeywell, Carrier, Lennox, JUST $4.73 each when you order 4 $6.99, 4/$18.91 Furnace Filter Air Cleaner Filter 20x20x1 for Honeywell, Carrier, Lennox JUST $3.79 each in case of 12 $45.51 Furnace Filter Air Cleaner Filter 16x25x1 for Honeywell, Carrier, Lennox 20x25x1 - JUST $5.41 each when you order 4 $6.99, 4/$21.63 Furnace Filter Air Cleaner Filter 20x25x1 for Honeywell, Carrier, Lennox JUST $4.32 each in case of 12 $51.84 When a new home is built, IAQ or indoor air quality is not a top priority of many home builders. Most heating and air conditioning (HVAC) contractors install a disposable fiberglass filter with your furnace or air conditioner, and while there is nothing wrong with these filters, they are only designed to provide the minimum protection for your HVAC system. Indoor Air Quality IAQ can be greatly enhanced by upgrading your furnace filter and replacing it with a media type air filter. Merv 8 rated filters are a great choice because they provide incredible filtration while maintaining great air flow. Air flow is very important, especially in newer multi- level homes. Reduce Dust, Pollen, Mold, and Pet Dander, by replacing the air filter in your furnace at least every three months.