18x20 Filter(352)
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Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack $39.96 Was $51.95

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Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
584.6 out of 5 Stars. 58 reviews
Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack $34.96 Was $45.45

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Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack
2414.8 out of 5 Stars. 241 reviews
Flash Deal Filterbuy 18x20x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack $41.36 Was $59.75

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Filterbuy 18x20x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
324.8 out of 5 Stars. 32 reviews
Filterbuy 18x20x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack $39.96

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$3996
current price $39.96Filterbuy 18x20x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack
774.8 out of 5 Stars. 77 reviews
Best seller Filtrete 18x20x1 Air Filter, MPR 300 MERV 5, Dust Reduction, 1 Filter $5.64

$564
current price $5.64Filtrete 18x20x1 Air Filter, MPR 300 MERV 5, Dust Reduction, 1 Filter
4184.5 out of 5 Stars. 418 reviews
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50+ bought since yesterday Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 800 MERV 10, Micro Particle Reduction, 1 Filter From $11.88

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Available in additional 3 optionsFrom$1188
Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 800 MERV 10, Micro Particle Reduction, 1 Filter
6764.5 out of 5 Stars. 676 reviews
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Best seller Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1500 MERV 12, Allergen, Bacteria and Virus, 1 Filter $18.47

$1847
current price $18.47Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1500 MERV 12, Allergen, Bacteria and Virus, 1 Filter
1524.7 out of 5 Stars. 152 reviews
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Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1000 MERV 11, Allergen Defense, 1 Filter $17.57

$1757
current price $17.57Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1000 MERV 11, Allergen Defense, 1 Filter
5344.7 out of 5 Stars. 534 reviews
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Aerostar 18x20x1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack $28.87

$2887
current price $28.87Aerostar 18x20x1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack
484.7 out of 5 Stars. 48 reviews
AMI PARTS 18x20x1 HVAC Furnace Air Filter MERV 8 for Dust Reduction,4 Filters $26.09

$2609
current price $26.09AMI PARTS 18x20x1 HVAC Furnace Air Filter MERV 8 for Dust Reduction,4 Filters
44.8 out of 5 Stars. 4 reviews
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Filterbuy 18x20x1 Air Filter MERV 13 Smoke Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack $44.96

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current price $44.96Filterbuy 18x20x1 Air Filter MERV 13 Smoke Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack
854.8 out of 5 Stars. 85 reviews
Filterbuy 18x20x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 12-Pack $88.92 Was $115.60

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Filterbuy 18x20x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 12-Pack
84.9 out of 5 Stars. 8 reviews
True Value 1000 Micro Filter, Pack of 4 - 18 x 20 x 1 in. $77.76

$7776
current price $77.76True Value 1000 Micro Filter, Pack of 4 - 18 x 20 x 1 in.
Best seller (4 pack) Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1500 MERV 12, Allergen, Bacteria and Virus, 1 Filter $73.88 $18.47/ea

$7388
current price $73.88$18.47/ea
(4 pack) Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1500 MERV 12, Allergen, Bacteria and Virus, 1 Filter
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Protect Plus Air 118201 Fiberglass Air Filter, 18" X 20" X 1" (Pack of 12) $55.99

$5599
current price $55.99Protect Plus Air 118201 Fiberglass Air Filter, 18" X 20" X 1" (Pack of 12)
BestAir B1-1820-11-6 18x20 x 1 In. MERV 11 Furnace Filter, 90 Days - Quantity 6

BestAir B1-1820-11-6 18x20 x 1 In. MERV 11 Furnace Filter, 90 Days - Quantity 6
Filterbuy 18x20x1 MERV 11 Allergen Defense, Pleated HVAC AC Furnace Air Filters (1-Pack) $15.00 $15.00/count

$1500
current price $15.00$15.00/count
Filterbuy 18x20x1 MERV 11 Allergen Defense, Pleated HVAC AC Furnace Air Filters (1-Pack)
164.6 out of 5 Stars. 16 reviews
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BNX TruFilter 18x20x1 Air Filter MERV 13 (4-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Pollen, Mold, Bacteria, Smoke, Allergen, MPR 1900 FPR 10 $46.99

$4699
current price $46.99BNX TruFilter 18x20x1 Air Filter MERV 13 (4-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Pollen, Mold, Bacteria, Smoke, Allergen, MPR 1900 FPR 10
14 out of 5 Stars. 1 reviews
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Clorox 18x20x1 Air Filter MERV 13 Virus & Bacteria Defense HVAC Furnace Filters, MPR 1900-2200 & FPR 9-10, 4 Count From $35.99

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Available in additional 3 optionsFrom$3599
Clorox 18x20x1 Air Filter MERV 13 Virus & Bacteria Defense HVAC Furnace Filters, MPR 1900-2200 & FPR 9-10, 4 Count
44.8 out of 5 Stars. 4 reviews
Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1000 MERV 11, Allergen Defense, 4 Pack $43.98 $11.00/ea

$4398
current price $43.98$11.00/ea
Filtrete 18x20x1 HVAC Furnace Air Filter, MPR 1000 MERV 11, Allergen Defense, 4 Pack
5384.7 out of 5 Stars. 538 reviews
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Filterbuy 18x20x1 Air Filter MERV 13 Smoke Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack $56.94

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current price $56.94Filterbuy 18x20x1 Air Filter MERV 13 Smoke Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
85 out of 5 Stars. 8 reviews
Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 12-Pack $79.92

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current price $79.92Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 12-Pack
234.8 out of 5 Stars. 23 reviews
Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack $39.96 Was $51.95

Now$3996
current price Now $39.96, Was $51.95$51.95
Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
584.6 out of 5 Stars. 58 reviews
Precisionaire Furnace Air Filter 18" X 20" X 1" Fiberglass $44.03

$4403
current price $44.03Precisionaire Furnace Air Filter 18" X 20" X 1" Fiberglass
18x20x1, Protect Plus Industries Air Filter, MERV 3

18x20x1, Protect Plus Industries Air Filter, MERV 3
25 out of 5 Stars. 2 reviews
10055.01182 18x20x1 FBG Furn Filter $46.57

$4657
current price $46.5710055.01182 18x20x1 FBG Furn Filter
10055.01182 18x20x1 FBG Furn Filter $57.57

$5757
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Best Air B1-1820-8-12 18" x 20" x 1" Pleated Furnace Air Filter 90 Days - Quantity of 12 $109.89

$10989
current price $109.89Best Air B1-1820-8-12 18" x 20" x 1" Pleated Furnace Air Filter 90 Days - Quantity of 12
Air-Care 18x20 Electrostatic Flexible Permanent Washable HVAC Furnace Filter, MERV 8 $44.95

$4495
current price $44.95Air-Care 18x20 Electrostatic Flexible Permanent Washable HVAC Furnace Filter, MERV 8
24 out of 5 Stars. 2 reviews
Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack $34.96 Was $45.45

Now$3496
current price Now $34.96, Was $45.45$45.45
Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack
2414.8 out of 5 Stars. 241 reviews
Filterbuy 18x20x1 Air Filter MERV 13 Smoke Defense, Pleated HVAC AC Furnace Filter Replacement, 12-Pack $105.96

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current price $105.96Filterbuy 18x20x1 Air Filter MERV 13 Smoke Defense, Pleated HVAC AC Furnace Filter Replacement, 12-Pack
54.8 out of 5 Stars. 5 reviews
3 Pack of 18x20x2 MERV 10 Pleated 2" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 19-1/2 x 1-3/4 $37.95

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$3795
current price $37.953 Pack of 18x20x2 MERV 10 Pleated 2" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 19-1/2 x 1-3/4
15 out of 5 Stars. 1 reviews
Filtrete 18x20x1 Air Filter, MPR 1500 MERV 12, Advanced Allergen Reduction, 1 New Filter From $18.47

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Available in additional 2 optionsFrom$1847
Filtrete 18x20x1 Air Filter, MPR 1500 MERV 12, Advanced Allergen Reduction, 1 New Filter
5844.8 out of 5 Stars. 584 reviews
18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted $47.64 Was $56.09

Now$4764
current price Now $47.64, Was $56.09$56.09
18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted
Protect Plus Air 118201 Fiberglass Air Filter, 18" X 20" X 1" (Pack of 12) $54.76

$5476
current price $54.76Protect Plus Air 118201 Fiberglass Air Filter, 18" X 20" X 1" (Pack of 12)
11 out of 5 Stars. 1 reviews
Flash Deal Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack $134.95

$13495
current price $134.95Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
10055.01182 18x20x1 FBG Furn Filter $42.93 Was $52.69

Now$4293
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10055.01182 18x20x1 FBG Furn Filter
18x20x1 (17_1/2x19_1/2) Pleated MERV 14 Air Filters 4 Pack From $52.99

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18x20x1 (17_1/2x19_1/2) Pleated MERV 14 Air Filters 4 Pack
3 Pack of 18x20x2 MERV 10 Pleated 2" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 19-1/2 x 1-3/4 $37.95

$3795
current price $37.953 Pack of 18x20x2 MERV 10 Pleated 2" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 19-1/2 x 1-3/4
15 out of 5 Stars. 1 reviews
18x20x1 in. Fiberglass 4 MERV Air Filter - Pack of 12 - White $58.31

$5831
current price $58.3118x20x1 in. Fiberglass 4 MERV Air Filter - Pack of 12 - White
15 out of 5 Stars. 1 reviews
10055.011820 18 x 20 x 1 in. EZ Flow II Spun Fiberglass Disposable Furnace Filter - Pack Of 12 $58.03

$5803
current price $58.0310055.011820 18 x 20 x 1 in. EZ Flow II Spun Fiberglass Disposable Furnace Filter - Pack Of 12
54.8 out of 5 Stars. 5 reviews
Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 1-Pack $46.99

$4699
current price $46.99Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 1-Pack
Protect Plus Air 118201 Fiberglass Air Filter, 18" X 20" X 1" (Pack of 12) $60.99

$6099
current price $60.99Protect Plus Air 118201 Fiberglass Air Filter, 18" X 20" X 1" (Pack of 12)
Filter King 18x20x2 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters, MADE IN USA, HVAC, Pleated, Electrostatic (Actual Size: 18 x 20 x 1.75) $83.14 Was $94.20

Now$8314
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Filter King 18x20x2 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters, MADE IN USA, HVAC, Pleated, Electrostatic (Actual Size: 18 x 20 x 1.75)
15 out of 5 Stars. 1 reviews
10055.01182 18x20x1 FBG Furn Filter $71.61

$7161
current price $71.6110055.01182 18x20x1 FBG Furn Filter
Flash Deal Filterbuy 18x20x2 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack $87.26 Was $96.96

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Filterbuy 18x20x2 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
Air Bear MERV 8 18x20x1 Pleated Air Filter 2-pack (Actual Size: 17.5x2x19.5x.75) $29.08

$2908
current price $29.08Air Bear MERV 8 18x20x1 Pleated Air Filter 2-pack (Actual Size: 17.5x2x19.5x.75)
Air Bear MERV 8 18x20x1 Pleated Air Filter 8-pack (Actual Size: 17.5x2x19.5x.75) $51.68

$5168
current price $51.68Air Bear MERV 8 18x20x1 Pleated Air Filter 8-pack (Actual Size: 17.5x2x19.5x.75)
84858011820 NaturalAire Standard Pleated Air Filter - Pack Of 12 - Natural - 18 x 20 x 1 in. $87.61 Was $109.85

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84858011820 NaturalAire Standard Pleated Air Filter - Pack Of 12 - Natural - 18 x 20 x 1 in.
18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted $46.57 Was $55.26

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18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted
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