21x21x4.5 Rheem / Ruud Air Filters

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Products   MERV Rating Filter Life Annual Cost Value Pack
21x21x4.5 Rheem Ruud MERV8 SpiroPure F
Rheem / Ruud Compatible (MERV 8)
    4.5 stars
  • $51.99
  • 2 Filters
  • ($26.00/filter)
MERV 8
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6 Months $51.99/yr
Best Value!

$51.99
2 Filters

($26.00/filter)
21x21x4.5 Rheem Ruud MERV11 SpiroPure F
Rheem / Ruud Compatible (MERV 11)
    5 stars
  • $62.99
  • 2 Filters
  • ($31.50/filter)
MERV 11
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6 Months $62.99/yr

$62.99
2 Filters

($31.50/filter)
21x21x4.5 Rheem Ruud MERV13 SpiroPure F
Rheem / Ruud Compatible (MERV 13)
  • $72.99
  • 2 Filters
  • ($36.50/filter)
MERV 13
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6 Months $72.99/yr

$72.99
2 Filters

($36.50/filter)
21x21x4.5 Rheem Ruud OdorBan SpiroPure F
Rheem / Ruud Compatible (OdorBan)
    4.5 stars
  • $91.99
  • 2 Filters
  • ($46.00/filter)
MERV 10
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6 Months Learn more
about odor eliminator filters
$91.99/yr

$91.99
2 Filters

($46.00/filter)
MERV Rating - Contaminant Removal Guide
MERV Rating   8 11 12 13
Lint & Dust  
Dust Mite Debris  
Pollen  
Mold Spores  
Pet Dander  
Auto Emissions  
Smoke  
Tobacco  
Bacteria  
Note: equals efficient removal of contaminant by filter.