Air circulators move air. They range from standard household, or residential, fans and ceiling fans to portable blowers and high velocity industrial blowers incorporated into mechanical cooling systems. Depending on the required application, air circulators are typically used in households, attics, offices, factories and warehouses. Uses generally include cooling, ventilation and the removal of toxic air, fumes or exhaust. Equipment specific attributes which vary by intended function can include blade diameter, width, phase, wattage, HP and drive type.