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  1. Do it Best 20 In. x 25 In. x 1 In. MERV 8 Furnace Filter - Knudson Lumber Company
    Do it Best 20 In. x 25 In. x 1 In. MERV 8 Furnace Filter SKU# 474304 UPC Code: 009326451893 $7.49/EA
    9 Available
  2. True Blue 12 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 12 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430135 UPC Code: 6505017150303 $3.49/EA
    6 Available
  3. True Blue 14 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 14 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430117 UPC Code: 641590000010 $3.49/EA
    6 Available
  4. True Blue 14 In. x 25 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 14 In. x 25 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430108 UPC Code: 641590000027 $2.99/EA
    10 Available
  5. True Blue 16 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 16 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430082 UPC Code: 641590000034 $2.99/EA
    2 Available
  6. True Blue 16 In. x 25 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 16 In. x 25 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430073 UPC Code: 641590000041 $3.49/EA
    4 Available
  7. True Blue 20 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 20 In. x 20 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430046 UPC Code: 641590000058 $3.49/EA
    9 Available
  8. True Blue 20 In. x 25 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 20 In. x 25 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 430037 UPC Code: 641590000065 $3.99/EA
    5 Available
  9. True Blue 24 In. x 24 In. x 1 In. Merv 2 Fiberglass Furnace Filter - Knudson Lumber Company
    True Blue 24 In. x 24 In. x 1 In. Merv 2 Fiberglass Furnace Filter SKU# 405591 UPC Code: 641590001307 $2.99/EA
    9 Available