The new MERV 8 Pre Pleat 40 filter features a filtering medium that is more efficient AND ecologically friendly. Made entirely from recycled materials this medium achieves MERV 8 efficiency with low resistance to airflow. It is also unaffected by high humidity and is hydrophobic (non-moisture absorbing.) All filters that are marked (CUSTOM) are special ordered and may take up to 3 weeks to be shipped to us. Then shipped to you please allow time. $10 per order for Shipping & Handling will be added on during check out with Paypal. All orders are sent UPS Ground.