21x33x1 Air Filters

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Products   MERV Rating Filter Life Annual Cost Value Pack
21x33x1 MERV8 SpiroPure O
MERV 8 Pleated Filters (6 Pack)
    5 stars
  • $94.99
  • 6 Filters
  • ($15.83/filter)
MERV 8
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3 Months $63.33/yr
Best Value!

$94.99
6 Filters

($15.83/filter)
21x33x1 MERV11 SpiroPure O
MERV 11 Pleated Filters (6 Pack)
  • $102.99
  • 6 Filters
  • ($17.17/filter)
MERV 11
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3 Months $68.66/yr

$102.99
6 Filters

($17.17/filter)
21x33x1 MERV13 SpiroPure F
MERV 13 Pleated Filters (6 Pack)
  • $109.99
  • 6 Filters
  • ($18.33/filter)
MERV 13
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3 Months $73.33/yr

$109.99
6 Filters

($18.33/filter)
21x33x1 OdorBan SpiroPure F
MERV 8 Odor Eliminator Filters (6 Pack)
  • $163.99
  • 6 Filters
  • ($27.33/filter)
MERV 8
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3 Months Learn more
about odor eliminator filters
$109.33/yr

$163.99
6 Filters

($27.33/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.