Changing your filters on a regular basis promotes good health. EZ Flow Fiberglass Disposable Filters - MERV 3-4, Heavy Duty Polyester Disposable Filters - MERV 5-6, Available in 1" and 2". Permanent Aluminum Holding Frame with Disposable Media Filter Pads - MERV 8 - Available in 1" - (BEST FILTER FOR PEOPLE WITH ALLERGIES.) ALL FILTERS ARE SOLD IN CASES OF 12. No Charge For Shipping. Our prices are listed on our website under the "Products" tab.