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20x20x4 MERV 10 ( FPR 6-7 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. Case of 6. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 11 ( FPR 8-9 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. 2 Pack. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 11 ( FPR 8-9 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. 4 Pack. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 11 ( FPR 8-9 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. Case of 6. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 13 ( FPR 10 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. 2 Pack. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 13 ( FPR 10 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. 4 Pack. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 13 ( FPR 10 ) Pleated 4" Inch Air Filters for HVAC Systems by Glasfloss. Case of 6. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 8 ( FPR 5-6 ) Pleated 4" Inch HVAC Filters for AC and Furnace. 2 Pack. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 8 ( FPR 5-6 ) Pleated 4" Inch HVAC Filters for AC and Furnace. 4 Pack. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4 MERV 8 ( FPR 5-6 ) Pleated 4" Inch HVAC Filters for AC and Furnace. Case of 6. Exact Size: 19-1/2 x 19-1/2 x 3-3/4

20x20x4.3 MERV 8 Replacement HVAC Filters for HONEYWELL-2 PK

20x20x5 Air Filter MERV 11 replacement for Trion Air Bear, Skuttle, Generalaire. Case of 4. (Actual Size: 20-5/8 x 19-5/8 x 4-7/8)