18x20x4 Filters

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18x20x4 AIRx DUST Air Filter - MERV 8
$23.61 / Filter
$29.51 Save 20%!
6 Pack Selected
$141.64
Ships Free!
18x20x4 AIRx ALLERGY Air Filter - MERV 11
$25.21 / Filter
$31.51 Save 20%!
6 Pack Selected
$151.25
Ships Free!
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What Our Customers Have to Say

Tim R. 1 day ago
5
Arrived in great condition. (I was concerned that the furnace filters may get crushed or dented in transit.) The first filter is being used now so you early to tell its durability. But it fit into the furnace air return slot perfectly, not to small nor to big.
Brian H. 1 day ago
5
Great filter to help with neighbors smoking and I feel it help with my allergies.
Larry M. 1 day ago
5
Your products are great and your website is easy to navigate and order from.
Charles E. 1 day ago
5
Great quality for the money fits correctly and works excellent with the heating and cooling system