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)
  • $81.99
  • 6 Filters
  • ($13.67/filter)
MERV 8
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3 Months $54.66/yr
Best Value!

$81.99
6 Filters

($13.67/filter)
20x28x2 MERV11 SpiroPure O
MERV 11 Geothermal Filters (6 Pack)
  • $94.99
  • 6 Filters
  • ($15.83/filter)
MERV 11
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3 Months $63.33/yr

$94.99
6 Filters

($15.83/filter)
20x28x2 MERV13 SpiroPure F
MERV 13 Geothermal Filters (6 Pack)
  • $104.99
  • 6 Filters
  • ($17.50/filter)
MERV 13
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3 Months $69.99/yr

$104.99
6 Filters

($17.50/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.