A less expensive alternative to ball bearing fans, Orion’s sealed sleeve series of fans provide comparative life expectancy at a significantly lower cost. Sealed sleeve DC fans cost 30-50% less than comparable ball-bearing fans. The Challenger Series fans also feature an L10 life expectancy of more than 50,000 hours, equating to nearly twice the life expectancy of standard sleeve bearing products. They are offered in seven sizes ranging from 40mm x 10mm to 120mm x 38mm, and are available in 12 VDC and 24 VDC versions.