Pamlico Air 10 in. W X 20 in. H X 1 in. D Fiberglass 4 MERV Air Filter 12pk The Pamlico select FDC air filter is a cost-effective and efficient, heavy-duty, and disposable fiberglass filter in a durable kraft board, two-piece die-cut frame. Effectively captures household dust and other large contaminants. Has a MERV rating of 4. Lasts for up to 30 days and protects the HVAC system. Our select FDC air filter features durable construction including a heavy-duty frame with reinforced grids on one side. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.