Maradyne MM22KT Mack Two 11" 225W Dual Pulelr Fan w/Top/Bottom Flange. At Maradyne we design only the highest quality components into our fan assemblies. All plastic components are molded from engineering grade glass filled nylon resin. All motors are designed for long life, high durability and use in harsh environments. These motors perform exceptionally well on the track and in extreme off-road conditions. All fan products are performance tested using our in house air test chamber which insures you can trust our performance numbers. Maradyne engineering also controls and monitors the design and manufacture of our fan assemblies at every step of the process, insuring you get quality product everytime. Maradyne engineering strives to improve upon existing industry accepted designs so you get the best fan for your buck. Maradyne fans are found on NASCAR cars & trucks, dragsters, hot rods, off-road vehicles, mobile generator sets, military vehicles, buses, golf carts, and many other specialty applications.