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20x21x4 Air Filters

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Products   MERV Rating Filter Life Annual Cost Value Pack
MERV 8 20x21x4 SpiroPure O
MERV 8 Pleated Filters (6 Pack)
  • $125.99
  • 6 Filters
  • ($21.00/filter)
MERV 8
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3 Months $83.99/yr
Best Value!

$125.99
6 Filters

($21.00/filter)
MERV 11 20x21x4 SpiroPure O
MERV 11 Pleated Filters (6 Pack)
  • $149.99
  • 6 Filters
  • ($25.00/filter)
MERV 11
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3 Months $99.99/yr

$149.99
6 Filters

($25.00/filter)
MERV 13 20x21x4 SpiroPure F
MERV 13 Pleated Filters (6 Pack)
  • $128.99
  • 6 Filters
  • ($21.50/filter)
MERV 13
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3 Months $85.99/yr

$128.99
6 Filters

($21.50/filter)
20x21x4 Odorban SpiroPure F
MERV 8 Odor Eliminator Filters (6 Pack)
  • $135.99
  • 6 Filters
  • ($22.67/filter)
MERV 8
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3 Months Learn more
about odor eliminator filters
$90.66/yr

$135.99
6 Filters

($22.67/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.