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
  • $40.99
  • 6 Filters
  • ($6.83 / filters)
MERV 8
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3 Months $27.33
Best Value!

$40.99
6 Filters

($6.83 / filter)
18x20x1 MERV8 SpiroPure O
MERV 8 18x20x1 Filters (Nominal Size)
    5 stars
  • $81.98
  • 12 Filters
  • ($6.83 / filters)
MERV 8
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3 Months $27.33
Best Value!

$81.98
12 Filters

($6.83 / filter)
MERV 11 18x20x1 SpiroPure O
MERV 11 18x20x1 Filters (Nominal Size)
    5 stars
  • $45.99
  • 6 Filters
  • ($7.67 / filters)
MERV 11
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3 Months $30.66

$45.99
6 Filters

($7.67 / filter)
18x20x1 MERV11 SpiroPure O
MERV 11 18x20x1 Filters (Nominal Size)
    5 stars
  • $91.98
  • 12 Filters
  • ($7.67 / filters)
MERV 11
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3 Months $30.66

$91.98
12 Filters

($7.67 / filter)
MERV 13 18x20x1 SpiroPure O
MERV 13 18x20x1 Filters (Nominal Size)
    5 stars
  • $51.99
  • 6 Filters
  • ($8.67 / filters)
MERV 13
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3 Months $34.66

$51.99
6 Filters

($8.67 / filter)
18x20x1 MERV13 SpiroPure O
MERV 13 18x20x1 Filters (Nominal Size)
    5 stars
  • $103.98
  • 12 Filters
  • ($8.67 / filters)
MERV 13
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3 Months $34.66

$103.98
12 Filters

($8.67 / 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.