21x21x4.5 Rheem / Ruud Air Filters

Sort by:
Products   MERV Rating Filter Life Annual Cost Value Pack
21x21x4.5 Rheem Ruud MERV8 SpiroPure F
Rheem / Ruud Compatible (MERV 8)
  • $49.99
  • 2 Filters
  • ($25.00/filter)
MERV 8
Learn more
6 Months $49.99/yr
Best Value!

$49.99
2 Filters

($25.00/filter)
21x21x4.5 Rheem Ruud MERV11 SpiroPure F
Rheem / Ruud Compatible (MERV 11)
  • $60.99
  • 2 Filters
  • ($30.50/filter)
MERV 11
Learn more
6 Months $60.99/yr

$60.99
2 Filters

($30.50/filter)
21x21x4.5 Rheem Ruud MERV13 SpiroPure F
Rheem / Ruud Compatible (MERV 13)
  • $69.99
  • 2 Filters
  • ($35.00/filter)
MERV 13
Learn more
6 Months $69.99/yr

$69.99
2 Filters

($35.00/filter)
21x21x4.5 Rheem Ruud OdorBan SpiroPure F
Rheem / Ruud Compatible (OdorBan)
  • $88.99
  • 2 Filters
  • ($44.50/filter)
MERV 8
Learn more
6 Months Learn more
about odor eliminator filters
$88.99/yr

$88.99
2 Filters

($44.50/filter)
MERV Rating - Contaminant Removal Guide
MERV Rating   8 11 12 13
Lint & Dust  
Dust Mile Debris  
Pollen  
Mold Spores  
Pet Dander  
Auto Emissions  
Smoke  
Tobacco  
Bacteria  
Note: equals efficient removal of contaminant by filter.