18x20x1 Air Filters

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Products   MERV Rating Filter Life Annual Cost Value Pack
MERV 8 18x20x1 SpiroPure O
MERV 8 18x20x1 Filters (Nominal Size)
    5 stars
  • $42.22
  • 6 Filters
  • ($7.04 / filters)
MERV 8
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3 Months $28.15
Best Value!

$42.22
6 Filters

($7.04 / filter)
18x20x1 MERV8 SpiroPure O
MERV 8 18x20x1 Filters (Nominal Size)
    5 stars
  • $84.44
  • 12 Filters
  • ($7.04 / filters)
MERV 8
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3 Months $28.15
Best Value!

$84.44
12 Filters

($7.04 / filter)
MERV 11 18x20x1 SpiroPure O
MERV 11 18x20x1 Filters (Nominal Size)
    5 stars
  • $47.37
  • 6 Filters
  • ($7.90 / filters)
MERV 11
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3 Months $31.58

$47.37
6 Filters

($7.90 / filter)
18x20x1 MERV11 SpiroPure O
MERV 11 18x20x1 Filters (Nominal Size)
    5 stars
  • $94.74
  • 12 Filters
  • ($7.90 / filters)
MERV 11
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3 Months $31.58

$94.74
12 Filters

($7.90 / filter)
MERV 13 18x20x1 SpiroPure O
MERV 13 18x20x1 Filters (Nominal Size)
    5 stars
  • $53.55
  • 6 Filters
  • ($8.93 / filters)
MERV 13
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3 Months $35.70

$53.55
6 Filters

($8.93 / filter)
18x20x1 MERV13 SpiroPure O
MERV 13 18x20x1 Filters (Nominal Size)
    5 stars
  • $107.10
  • 12 Filters
  • ($8.93 / filters)
MERV 13
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3 Months $35.70

$107.10
12 Filters

($8.93 / 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.