6 Pack of 16x25x4 MERV 10 Pleated 4" Inch Air Filters by Glasfloss. Actual Size: 15-1/2 x 24-1/2 x 3-3/4 - Walmart.com
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Honeywell 16x20x4 Air Filter Replacement - FC100A1003 HVAC Furnace Filters Merv 11 Filter Media, AC Filter with Homequip Disposal Bag, 3-Pack (Actual Size: 15.94 x 19.75 x 4.38 Inches) - Amazon.com
20x25x4 MERV 13 ( MPR 2200 ) AC Furnace 4" Inch Air Filters by Glasfloss Industries. 6 Pack. Actual Size: 19-1/2" x 24-1/2" x 3-3/4" - Walmart.com
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16x25x4 MERV 8 AC Furnace 4" Inch Air Filter. 6 PACK. (Actual Depth: 3-3/4") - Walmart.com
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Why Does Furnace Filter Thickness Matter?
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Glasfloss ZL 16x25x4 MERV 10 Pleated 4" Inch Air Filters for AC and Furnace. 3 PACK. Actual Size: 15-1/2 x 24-1/2 x 3-3/4 - Amazon.com