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)
  • $164.03
  • 6 Filters
  • ($27.34 / filters)
MERV 8
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3 Months $109.35
Best Value!

$164.03
6 Filters

($27.34 / filter)
MERV 11 20x21x4 SpiroPure O
MERV 11 Pleated Filters (6 Pack)
  • $211.26
  • 6 Filters
  • ($35.21 / filters)
MERV 11
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3 Months $140.84

$211.26
6 Filters

($35.21 / filter)
MERV 13 20x21x4 SpiroPure O
MERV 13 Pleated Filters (6 Pack)
  • $223.94
  • 6 Filters
  • ($37.32 / filters)
MERV 13
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3 Months $149.29

$223.94
6 Filters

($37.32 / filter)
20x21x4 Odorban SpiroPure F
MERV 10 Odor Eliminator Filters (6 Pack)
  • $285.72
  • 6 Filters
  • ($47.62 / filters)
MERV 10
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3 Months Learn more
about odor eliminator filters
$190.48

$285.72
6 Filters

($47.62 / 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.