20x37x2 Geothermal Air Filters

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Products   MERV Rating Filter Life Annual Cost Value Pack
20x37x2 MERV8 SpiroPure O
MERV 8 Geothermal Filters (6 Pack)
    5 stars
  • $179.11
  • 6 Filters
  • ($29.85 / filters)
MERV 8
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3 Months $119.41
Best Value!

$179.11
6 Filters

($29.85 / filter)
20x37x2 MERV11 SpiroPure O
MERV 11 Geothermal Filters (6 Pack)
    5 stars
  • $210.91
  • 6 Filters
  • ($35.15 / filters)
MERV 11
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3 Months $140.61

$210.91
6 Filters

($35.15 / filter)
20x37x2 MERV13 SpiroPure O
MERV 13 Geothermal Filters (6 Pack)
    5 stars
  • $219.40
  • 6 Filters
  • ($36.57 / filters)
MERV 13
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3 Months $146.27

$219.40
6 Filters

($36.57 / 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.