20x28x2 Geothermal Air Filters

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Products   MERV Rating Filter Life Annual Cost Value Pack
20x28x2 MERV8 SpiroPure O
MERV 8 Geothermal Filters (6 Pack)
  • $112.60
  • 6 Filters
  • ($18.77 / filters)
MERV 8
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3 Months $75.07
Best Value!

$112.60
6 Filters

($18.77 / filter)
20x28x2 MERV11 SpiroPure O
MERV 11 Geothermal Filters (6 Pack)
    5 stars
  • $137.80
  • 6 Filters
  • ($22.97 / filters)
MERV 11
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3 Months $91.87

$137.80
6 Filters

($22.97 / filter)
20x28x2 MERV13 SpiroPure O
MERV 13 Geothermal Filters (6 Pack)
    3.5 stars
  • $170.11
  • 6 Filters
  • ($28.35 / filters)
MERV 13
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3 Months $113.41

$170.11
6 Filters

($28.35 / 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.