18x24x4 Filters

Showing 1 -  3 of 3 Products
18x24x4 AIRx DUST Air Filter - MERV 8
$16.53 / Filter
$20.67 Save 20%!
6 Pack Selected
$99.19
Ships Free!
18x24x4 AIRx ALLERGY Air Filter - MERV 11
$18.64 / Filter
$23.30 Save 20%!
6 Pack Selected
$111.84
Ships Free!
18x24x4 AIRx HEALTH Air Filter - MERV 13
$28.31 / Filter
$35.39 Save 20%!
6 Pack Selected
$169.88
Ships Free!
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What Our Customers Have to Say

John B. 1 day ago
5
We ordered from discount filters about 18 years ago and we keep getting more every time it’s needed for replacement. This is the first time ordering for the Winix air cleaner
John M. 1 day ago
5
The best value product.
Diane W. 2 days ago
5
I love these filters!! They work great and keep my furnace running really well. I’ve used them for 3 years and at each furnace check up the Tech is impressed with how well they keep my furnace running clean and efficient. I buy 12 once a year and switch them out every 30-33 days. A 12 pack is very affordable at less than $10 each.
David R. 3 days ago
5
Excellent quality Merv-11 high flow HVAC filter. Like that it is high flow and does not put a strain on the fan motor and air flow.