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FURNACE FILTERS
1 Thick
2 Thick
4 Thick
1 inch Furnace Filter
10x20x1
12x12x1
12x18x1
12x20x1
12x24x1
14x20x1
14x24x1
14x25x1
14x30x1
15x20x1
16x16x1
16x20x1
16x24x1
16x25x1
18x18x1
18x20x1
18x24x1
18x25x1
20x20x1
20x24x1
20x25x1
20x30x1
24x24x1
24x30x1
25x25x1
2 inch Furnace Filter
10x20x2
12x20x2
12x24x2
14x20x2
14x24x2
14x25x2
15x20x2
16x16x2
16x20x2
16x24x2
16x25x2
18x18x2
18x20x2
18x24x2
18x25x2
20x20x2
20x24x2
20x25x2
20x30x2
24x24x2
24x30x2
25x25x2
4 inch Furnace Filter
12x24x4
16x20x4
16x24x4
16x25x4
18x24x4
20x20x4
20x24x4
20x25x4
24x24x4
5 inch Furnace Filters
16x25x5
20x20x5
20x25x5
STANDARD SIZES
10 x 10
10x20
12x24
14x14
16x20
16x25
18x18
18x24
18x25
20x20
20x25
24x24
26x21
BY WIDTH
0" - 24
5" - 19
5" - 28
BY HEIGHT
8" - 22
3" - 25
MERV RATING
5 to 7
8 to 10
11 to 13
14 to 16

How Often Should I Replace My Furnace Filter?

Most of the companies and experts that the furnace filters should be changed or at least inspected once a month during the heating season for optimal healthy environment and furnace performance. But many homeowners find this answer less satisfying and indeed there are more aspects related to this area than one can imagine. That makes it more complex but the process is equally rewarding once you understand all the aspects related to the changing of furnace filters.

The frequency of changing the furnace filter varies from house to house and filter to filter. Some of the filters need replacements frequently while some of the conventional models do not require changing this often and can last long. The other side to conventional filters is that they are not exceptionally well in blocking dust particles so the blocking of the filter means that it will work well and will start blocking minute dust and other allergens. Changing furnace filter also depends on the situation. This means, if you have more pets or anyone in the house smokes regularly inside, then the filters will have to be changed more frequently, say once every month. Based on all of this, the recommendation is simple enough: Buy a enhanced filter, look at it monthly and plan to change it every three months, or every season if you have a arrangement heating and air-conditioning system that runs year-round.
 
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