Thru the wall sleeve for Friedrich uni fit air conditioners. Friedrich air conditioners are hard-working and hard-wearing. You'll find a range of choices: room, portable, ductless split systems, to name just a few. For quality, performance, efficiency, choice and service, Friedrich is the name to know. Friedrich commercial-grade products are the first choice for tough environments, from oil rigs to the Kennedy space center. Constructed from the highest-quality materials and components, these units are built to exacting standards and yet they are among the quietest and most energy-efficient available.