The Dial 3078 Dura-Cool Roll (cut-to-fit) is a highly-reliable, durable product from Dial. This 4500 CFM roll is high-efficiency foamed polyester that is more efficient than paper pads. It comes in a 29" x 144" roll, and is designed to be used with any cooler. Duracool Evaporative cooler pads are known to be the most advanced cooler pad on the market. 10 degrees cooler than paper and 6 degrees cooler than aspen pads. Duracool's synthetic blue fiber cools more air more efficiently while removing particulates from the air. This non-allergenic odorless pad won't shed fiber! In addition, buy Duracool rolls and you will be able to cut the pad to your exact needs. This roll has more than enough to do any 4000/4500 cooler at least once possibly twice for side draft coolers.