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Replacement for ReservePro # 4531 Air Filter - 20x20x5
(case of 2 Filters)

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Mfg:National Filter Sales
In Stock
Price: $43.90
($21.95 ea)
case of 2 Filters

Replacement for ReservePro # 4531 Air Filter - 20x20x5 - (2-Pack )

Actual Size - 19-11/16" X 20-11/16" X 4-15/16"

This replacement for the ReservePro 4531 is made by National Filter Sales.  The filter can be used in air cleaner cabinets from several manufacturers, including GeneralAire, Source-1, Trion,  and Skuttle.  The filter is constructed with highly efficient pleated synthetic media in a sturdy beverage board frame.

Replaces GeneralAire filters # 5FM2020, GFI#4531
Fits GeneralAire MAC2020 Air Cleaner
Replaces Trion Air Bear # 255649-103,  259112-103
Fits Trion Air Bear Supreme 20X20 Air Cleaner
Replaces Source-1 # FM1020205
Fits Source-1 # S1-MAC1020205 Air Cleaner
Replaces Skuttle # DB-20-20, #448-3, 000-0448-003
Fits Skuttle # DB0-0020-020 Air Cleaner


  • MERV 11 Efficiency Rating
  • Moisture resistant frame remains sturdy even in high humidity 
  • Rust resistant galvanized wire downstream gives the filter rigidity and holds media in place after installation 
  • Built-in support fingers hold pleats in place and allow for maximum dust holding 
  • Foam gasket helps seal the filter into the air cleaner and prevents dust from bypassing the filter
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