20.75x21.5x4 Air Filters

Sort by:
Products   MERV Rating Filter Life Annual Cost Value Pack
20.75x21.5x4 MERV8 SpiroPure O
MERV 8 Pleated Filters (6 Pack)
  • $135.99
  • 6 Filters
  • ($22.67/filter)
MERV 8
Learn more
3 Months $90.66/yr
Best Value!

$135.99
6 Filters

($22.67/filter)
20.75x21.5x4 MERV11 SpiroPure O
MERV 11 Pleated Filters (6 Pack)
  • $149.99
  • 6 Filters
  • ($25.00/filter)
MERV 11
Learn more
3 Months $99.99/yr

$149.99
6 Filters

($25.00/filter)
20.75x21.5x4 MERV13 SpiroPure O
MERV 13 Pleated Filters (6 Pack)
  • $152.99
  • 6 Filters
  • ($25.50/filter)
MERV 13
Learn more
3 Months $101.99/yr

$152.99
6 Filters

($25.50/filter)
20.75x21.5x4 OdorBan SpiroPure F
MERV 8 Odor Eliminator Filters (6 Pack)
  • $224.99
  • 6 Filters
  • ($37.50/filter)
MERV 8
Learn more
3 Months Learn more
about odor eliminator filters
$149.99/yr

$224.99
6 Filters

($37.50/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.