The 9" High-Velocity Fan features a powerful 3-speed high-torque motor and a heavy-duty aluminum blade. The F-4092 has all metal construction and a reinforced wire grill.. 3 speeds. Industrial-grade high-velocity fan. Reinforced wire grille. All-metal construction. Aluminum heavy-duty blade. Head tilts for use as air circulator. OSHA-approved 3-prong grounded plug