EnviroPureFX HEPADM400 HEPA Air Cleaner Replacement Filter Bundles MERV 11 Prefilter + Carbon Pad:(4) MERV 11 + (4) Carbon Filters Best Value The needled fibers create a Pre certified The needled fibers create a dense mat that produces a MERV 10 rating and higher mechanical efficiency at a lower air resistance than other pleated filters gasket seal high quality replacement filters protects your system’s performance and keeps the air in your home as clean and comfortable as possible While you may carefully vacuum the surface of the carbon or MERV 11 filters using a soft bristle brush attachment to remove visible buildup