failure. Replacing the flywheel may require disconnecting wiring and requires removing the switch housing that's on the way for the flywheel to be removed and replaced. Rotor, an alternative to blade irons. First patented by industrial designer Ron Rezek in 1991, the one-piece die-cast rotor receives and secures the blades and bolts right to the motor, eliminating most balance problems and minimizing exposed fasteners. A mechanism for mounting the fan to the ceiling such as: Ball-and-socket system. With this system, there is a metal or plastic hemisphere mounted on the end of the downrod; this hemisphere rests in a ceiling-mounted metal bracket, or self-supporting canopy, and allows the fan to move freely (which is very useful on vaulted ceilings). J-hook and Shackle clamp. A type of mounting system where the ceiling fan hangs on a hardened metal hook, screwed into the ceiling or bolted through a steel I-beam. The fan can be mounted directly on a ceiling hook, making the junction box optional. A porcelain or rubber grommet is used to reduce vibration and to electrically isolate the fan from the ceiling hook. This type of mounting is most common on antique ceiling fans and ceiling fans made for industrial use. A variation of this system using a U-bracket secured to the ceiling by means of lag bolts is often used on heavy-duty ceiling fans with electrically reversible motors in order to reduce the risk of the fan unscrewing itself from the ceiling while running in clockwise. This type of mount is ideally suited to the RC flat roof with metal hooks and has become ubiquitous in South Asia, including Bangladesh, India, Pakistan, etc. Flush mount (also known as "low profile" or "hugger" ceiling fans). These are specially designed fans with no downrod or canopy like a traditional mount fan. The motor housing appears to be directly attached to the ceiling, that is where the name "hugger" comes from. They are ideal for rooms with low ceilings ranging in height between 7'6" and 8'6". A disadvantage to this design is that since the blades are mounted so close to the ceiling, air movement is greatly reduced. Some ball-and-socket fans can be mounted using a low-ceiling adapter, purchased specially from the fan's manufacturer. This allows the same design to be used in both a high and low ceiling environment, simplifying the buying decision for consumers. In recent years, it has become