Tired of continually replacing your mobile drum fans? Schaefer mobile drum fans have "Schaefer-Tough" polyethylene housing and durable reinforced galvanized steel wheel carriage for impact and rust resistance. These fans are built to last, the best looking fans in the industry and move massive amounts of air at high velocities. A single "Schaefer-Tough" mobile fan will not only take the place of several lower performance fans, but out live them as well, lasting for 10+ years.