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.