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Furnace Filters & Accessories

DP03DC-4 Electrostatic Air Filter, 25 x 20 x 4, 97 % Filter Efficiency, Microfiber Filter Media
Filtrete
DP03DC-4 Electrostatic Air Filter, 25 x 20 x 4, 97 % Filter Efficiency, Microfiber Filter Media
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Sku: 36090118 More Options
3 Available at SAN MARCOS
$34.99
DP02DC-4 Electrostatic Air Filter, 20 x 20 x 4, 97 % Filter Efficiency, Pleated Fabric Filter Media
Filtrete
DP02DC-4 Electrostatic Air Filter, 20 x 20 x 4, 97 % Filter Efficiency, Pleated Fabric Filter Media
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Sku: 36090146 More Options
3 Available at SAN MARCOS
$34.99
9820DC-6 Washable Air Filter, 24 x 12 x 1, 11 MERV, 90 % Filter Efficiency, Cardboard Frame, White
Filtrete
9820DC-6 Washable Air Filter, 24 x 12 x 1, 11 MERV, 90 % Filter Efficiency, Cardboard Frame, White
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Sku: 36090306 More Options
5 Available at SAN MARCOS
$13.99
9824DC-6 Air Filter, 30 x 14 x 1, 11 MERV, 90 % Filter Efficiency, Cardboard Frame, White
Filtrete
9824DC-6 Air Filter, 30 x 14 x 1, 11 MERV, 90 % Filter Efficiency, Cardboard Frame, White
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Sku: 36090312 More Options
3 Available at SAN MARCOS
$13.99
2020DC-6 Electrostatic Air Filter, 24 x 12 x 1, 11 MERV, Microfiber Filter Media, Cardboard Frame
Filtrete
2020DC-6 Electrostatic Air Filter, 24 x 12 x 1, 11 MERV, Microfiber Filter Media, Cardboard Frame
Project Lists Icon
Sku: 36090314 More Options
3 Available at SAN MARCOS
$18.99
2024DC-6 Electrostatic Air Filter, 30 x 14 x 1, 11 MERV, Microfiber Filter Media, Cardboard Frame
Filtrete
2024DC-6 Electrostatic Air Filter, 30 x 14 x 1, 11 MERV, Microfiber Filter Media, Cardboard Frame
Project Lists Icon
Sku: 36090318 More Options
3 Available at SAN MARCOS
$18.99
85256.012030 Air Filter, 30 x 20 x 1, 10 MERV
NaturalAire
85256.012030 Air Filter, 30 x 20 x 1, 10 MERV
Project Lists Icon
Sku: 36090402
0 Available at SAN MARCOS
$11.99
85256.012020 Microparticle Air Filter, 20 x 20 x 1, 10 MERV, Clay Frame
NaturalAire
85256.012020 Microparticle Air Filter, 20 x 20 x 1, 10 MERV, Clay Frame
Project Lists Icon
Sku: 36090404
0 Available at SAN MARCOS
$12.99
AB2025-13R Air Filter, 20 in L, 25 in W, 13 MERV
BestAir
AB2025-13R Air Filter, 20 in L, 25 in W, 13 MERV
Project Lists Icon
Sku: 36090406
0 Available at SAN MARCOS
$22.99
95003.01202 Panel Air Filter, 20 x 20 x 1, 13 MERV, Cardboard Frame
NaturalAire
95003.01202 Panel Air Filter, 20 x 20 x 1, 13 MERV, Cardboard Frame
Project Lists Icon
Sku: 36090408
0 Available at SAN MARCOS
$22.99
HW2025-13R Air Filter, 24-5/8 x 19-3/4 x 4-1/4, 13 MERV
BestAir
HW2025-13R Air Filter, 24-5/8 x 19-3/4 x 4-1/4, 13 MERV
Project Lists Icon
Sku: 36090410
0 Available at SAN MARCOS
$34.99
85256.011620 Pleated Air Filter, 20 x 16 x 1, 10 MERV, Clay Coated Frame
NaturalAire
85256.011620 Pleated Air Filter, 20 x 16 x 1, 10 MERV, Clay Coated Frame
Project Lists Icon
Sku: 36090412
0 Available at SAN MARCOS
$12.99
85256.011625 Pleated Air Filter, 25 x 16 x 1, 10 MERV, Clay Coated Frame
NaturalAire
85256.011625 Pleated Air Filter, 25 x 16 x 1, 10 MERV, Clay Coated Frame
Project Lists Icon
Sku: 36090414
0 Available at SAN MARCOS
$12.99
85256.011425 Pleated Air Filter, 25 x 14 x 1, 10 MERV, Clay Coated Frame
NaturalAire
85256.011425 Pleated Air Filter, 25 x 14 x 1, 10 MERV, Clay Coated Frame
Project Lists Icon
Sku: 36090418
0 Available at SAN MARCOS
$12.99
NaturalAire 87357.01162 Pleated Furnace Air Filter, 20 x 16 x 1, 4 MERV, Craft Die Cut Frame
Flanders
NaturalAire 87357.01162 Pleated Furnace Air Filter, 20 x 16 x 1, 4 MERV, Craft Die Cut Frame
Project Lists Icon
Sku: 36900100 More Options
2 Available at SAN MARCOS
$12.99
NaturalAire 87357.01163 Pleated Furnace Air Filter, 25 x 16 x 1, 4 MERV, Craft Die Cut Frame
Flanders
NaturalAire 87357.01163 Pleated Furnace Air Filter, 25 x 16 x 1, 4 MERV, Craft Die Cut Frame
Project Lists Icon
Sku: 36900102 More Options
6 Available at SAN MARCOS
$12.99
NaturalAire 87357.01202 Pleated Furnace Air Filter, 20 x 20 x 1, 4 MERV, Craft Die Cut Frame
Flanders
NaturalAire 87357.01202 Pleated Furnace Air Filter, 20 x 20 x 1, 4 MERV, Craft Die Cut Frame
Project Lists Icon
Sku: 36900104 More Options
9 Available at SAN MARCOS
$12.99
NaturalAire 87357.01203 Pleated Furnace Air Filter, 25 x 20 x 1, 4 MERV, Craft Die Cut Frame
Flanders
NaturalAire 87357.01203 Pleated Furnace Air Filter, 25 x 20 x 1, 4 MERV, Craft Die Cut Frame
Project Lists Icon
Sku: 36900106 More Options
4 Available at SAN MARCOS
$12.99
10055.01141 Furnace Air Filter, 14 x 14 x 1, 4 MERV, Chipboard Frame
Flanders
10055.01141 Furnace Air Filter, 14 x 14 x 1, 4 MERV, Chipboard Frame
Project Lists Icon
Sku: 36900108 More Options
10 Available at SAN MARCOS
$2.49
9810DC-6 Air Filter, 12 x 12 x 1, 11 MERV, 90 % Filter Efficiency, Microfiber Filter Media, White
Filtrete
9810DC-6 Air Filter, 12 x 12 x 1, 11 MERV, 90 % Filter Efficiency, Microfiber Filter Media, White
Project Lists Icon
Sku: 3690122 More Options
3 Available at SAN MARCOS
$13.99
2010DC-6 Electrostatic Air Filter, 12 x 12 x 1, 11 MERV, 90 % Filter Efficiency, Microfiber Filter Media
Filtrete
2010DC-6 Electrostatic Air Filter, 12 x 12 x 1, 11 MERV, 90 % Filter Efficiency, Microfiber Filter Media
Project Lists Icon
Sku: 3690124
0 Available at SAN MARCOS
$18.99
9803-4 Air Filter, 25 x 20 x 1, 11 MERV, 1000 MPR
Filtrete
9803-4 Air Filter, 25 x 20 x 1, 11 MERV, 1000 MPR
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Sku: 11120049 More Options
4 Available at SAN MARCOS
$13.99
BA20-4 Air Filter, 24 x 12 x 1, 5 MERV, 300 MPR
Filtrete
BA20-4 Air Filter, 24 x 12 x 1, 5 MERV, 300 MPR
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Sku: 1614882-052303-36 More Options
41 Available for SHIP TO STORE
$7.88
AL11-4 Air Filter, 14 x 14 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Filtrete
AL11-4 Air Filter, 14 x 14 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
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Sku: 1614890-052303-36 More Options
10 Available for SHIP TO STORE
$13.74
AL16-4 Air Filter, 16 x 16 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Filtrete
AL16-4 Air Filter, 16 x 16 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
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Sku: 1614932-052303-36 More Options
25 Available for SHIP TO STORE
$13.74
AL28-4 Air Filter, 30 x 18 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Filtrete
AL28-4 Air Filter, 30 x 18 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
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Sku: 1614957-052303-36 More Options
44 Available for SHIP TO STORE
$17.01
CL20-4 Air Filter, 24 x 12 x 1, 7 MERV, 600 MPR
Filtrete
CL20-4 Air Filter, 24 x 12 x 1, 7 MERV, 600 MPR
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Sku: 1614965-052303-36 More Options
91 Available for SHIP TO STORE
$9.84
AL42-4 Air Filter, 30 x 12 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Filtrete
AL42-4 Air Filter, 30 x 12 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Project Lists Icon
Sku: 1614973-052303-36
0 Available for SHIP TO STORE
$13.74
AL13-4 Air Filter, 30 x 24 x 1, MERV 11, 1000 MPR, Polypropylene Frame
Filtrete
AL13-4 Air Filter, 30 x 24 x 1, MERV 11, 1000 MPR, Polypropylene Frame
Project Lists Icon
Sku: 11120051 More Options
6 Available at SAN MARCOS
$13.99
AL15-4 Air Filter, 25 x 25 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Filtrete
AL15-4 Air Filter, 25 x 25 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Project Lists Icon
Sku: 1614999-052303-36 More Options
54 Available for SHIP TO STORE
$17.01
AL27-4 Air Filter, 30 x 16 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Filtrete
AL27-4 Air Filter, 30 x 16 x 1, 11 MERV, 1000 MPR, Polypropylene Frame
Project Lists Icon
Sku: 1615004-052303-36 More Options
64 Available for SHIP TO STORE
$17.01
9880DC-6 Dust and Pollen Reduction Air Filter, 12 x 12 x 1, 7 MERV, 600 MPR, Cardboard Frame
Filtrete
9880DC-6 Dust and Pollen Reduction Air Filter, 12 x 12 x 1, 7 MERV, 600 MPR, Cardboard Frame
Project Lists Icon
Sku: 3167723-052303-36 More Options
83 Available for SHIP TO STORE
$11.23
A201-SGM-BOX11R Air Filter, 19-3/4 x 24-1/4 x 6, 11 MERV, Cardboard Frame
BestAir
A201-SGM-BOX11R Air Filter, 19-3/4 x 24-1/4 x 6, 11 MERV, Cardboard Frame
Project Lists Icon
Sku: 3726957-052303-36 More Options
7 Available for SHIP TO STORE
$32.42
A401-SG4-11R Air Filter, 27 x 16 x 6, 11 MERV, 1000 to 1200 MPR
BestAir
A401-SG4-11R Air Filter, 27 x 16 x 6, 11 MERV, 1000 to 1200 MPR
Project Lists Icon
Sku: 3726965-052303-36
0 Available for SHIP TO STORE
$32.56
UP11-4 Air Filter, 14 x 14 x 1, 12 MERV, 1500 MPR
Filtrete
UP11-4 Air Filter, 14 x 14 x 1, 12 MERV, 1500 MPR
Project Lists Icon
Sku: 3746880-052303-36 More Options
14 Available for SHIP TO STORE
$21.09
UP23-4 Air Filter, 24 x 12 x 1, 12 MERV, 1500 MPR
Filtrete
UP23-4 Air Filter, 24 x 12 x 1, 12 MERV, 1500 MPR
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Sku: 3746906-052303-36 More Options
27 Available for SHIP TO STORE
$18.99
UT20-4 Air Filter, 24 x 12 x 1, 13 MERV, 1900 MPR
Filtrete
UT20-4 Air Filter, 24 x 12 x 1, 13 MERV, 1900 MPR
Project Lists Icon
Sku: 3746914-052303-36
0 Available for SHIP TO STORE
$21.59
UT22-4 Air Filter, 30 x 20 x 1, 13 MERV, 1900 MPR
Filtrete
UT22-4 Air Filter, 30 x 20 x 1, 13 MERV, 1900 MPR
Project Lists Icon
Sku: 3746922-052303-36 More Options
61 Available for SHIP TO STORE
$21.59
9822DC-6 Micro Allergen Reduction Filter, 30 x 20 x 1, 11 MERV, 1000 MPR
Filtrete
9822DC-6 Micro Allergen Reduction Filter, 30 x 20 x 1, 11 MERV, 1000 MPR
Project Lists Icon
Sku: 3690120 More Options
2 Available at SAN MARCOS
$13.99
300DC-6 Dust Reduction Air Filter, 20 x 16 x 1, 6 MERV, 300 MPR
Filtrete
300DC-6 Dust Reduction Air Filter, 20 x 16 x 1, 6 MERV, 300 MPR
Project Lists Icon
Sku: 4700423-052303-36 More Options
201 Available for SHIP TO STORE
$7.88
SM1006 Air Filter, 30 x 20 x 1, 4 MERV, Synthetic Roll Frame
NaturalAire
SM1006 Air Filter, 30 x 20 x 1, 4 MERV, Synthetic Roll Frame
Project Lists Icon
Sku: 7389430-052303-36 More Options
71 Available for SHIP TO STORE
$11.99
HR24240 Air Filter, 240 x 24 x 1, 3 to 4 MERV, Frameless Frame
Flanders
HR24240 Air Filter, 240 x 24 x 1, 3 to 4 MERV, Frameless Frame
Project Lists Icon
Sku: 7389455-052303-36 More Options
172 Available for SHIP TO STORE
$35.16
HR30240 Hammock Roll Air Filter, 240 x 30 x 1, 5 MERV, For: Lennox furnaces
Flanders
HR30240 Hammock Roll Air Filter, 240 x 30 x 1, 5 MERV, For: Lennox furnaces
Project Lists Icon
Sku: 7389463-052303-36 More Options
5 Available for SHIP TO STORE
$39.25
HR36240 Hammock Roll Air Filter, 240 x 36 x 1, 5 MERV, For: Lennox furnaces
Flanders
HR36240 Hammock Roll Air Filter, 240 x 36 x 1, 5 MERV, For: Lennox furnaces
Project Lists Icon
Sku: 7389471-052303-36 More Options
11 Available for SHIP TO STORE
$44.16
9800-4 Air Filter, 20 x 16 x 1, 11 MERV, 1000 MPR
Filtrete
9800-4 Air Filter, 20 x 16 x 1, 11 MERV, 1000 MPR
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Sku: 7448582-052303-36 More Options
310 Available for SHIP TO STORE
$13.99
9801-4 Air Filter, 25 x 16 x 1, 11 MERV, 1000 MPR
Filtrete
9801-4 Air Filter, 25 x 16 x 1, 11 MERV, 1000 MPR
Project Lists Icon
Sku: 36090116
0 Available at SAN MARCOS
$13.99
9802-4 Air Filter, 20 x 20 x 1, 11 MERV, 1000 MPR
Filtrete
9802-4 Air Filter, 20 x 20 x 1, 11 MERV, 1000 MPR
Project Lists Icon
Sku: 11120047 More Options
6 Available at SAN MARCOS
$13.99
9835 Dust and Pollen Reduction Air Filter, 20 x 14 x 1, 8 MERV, 600 um MPR, Synthetic Frame
Filtrete
9835 Dust and Pollen Reduction Air Filter, 20 x 14 x 1, 8 MERV, 600 um MPR, Synthetic Frame
Project Lists Icon
Sku: 8824674-052303-36 More Options
39 Available for SHIP TO STORE
$9.84