Purafilter Gold High-Efficiency Air Filters (4-Pack) from $17.09

Purafilter2000 Gold Series MERV 11 filter
Pack of four filters
High-efficiency air filter
Multiple sizes available
Traps micro-particles associated with allergies, like ragweed and pollen
Intrepid Filtration Media improves filter performance
Industrial-strength construction
Lasts up to 90 days