Ceiling Fan | Paddle Fan




• Ceiling Fans

Ceiling fans have different uses and they perform different tasks. They can also be used for different reasons in different seasons. The major task and work of the ceiling fan is to circulate the air in some specific area or room. There are some other basic uses of ceiling fans are available as well. It has 2 basic seasons of real use of it. One is the use in summer seasons, when ceiling fan is switched on, it circulates the air and evaporates the sweat of human skin and eliminates the perspiration effects on the human body. It is because it throws air on the human body in such a way, when the body is perspiring so as soon as human body receives the air due to sweat on the body, that air becomes so comfortable and leaves the feeling of coolness on the human body. It is the major function of ceiling fan in summer. Another major use of ceiling fans appears in winter season. It is used in winter to heat up the atmosphere. As air has a natural phenomenon of going upward if it is warm and getting downward on the earth and to sink in it if it is cold. So when the ceiling fan is used in winter it naturally throw the warm air downwards thus it makes the atmosphere warm and in this way the ceiling fan is used in winter. Book an appointment today to have a ceiling fan installed in your home or business.

Unlike air conditioners, ceiling fans only move air-they do not directly change its temperature. Therefore ceiling fans that have a mechanism for reversing the direction in which the blades rotate (most commonly an electrical switch on the side of the unit) can help in both heating and cooling. Some ceiling fans have adjustable blade pitch instead of reversible motor. In this case, the blade should be pitched to the right (or left if the motor spins clockwise) for downdraft, and left (or right if the motor spins clockwise) for updraft. Hunter Hotel Original is one example.

In summer, the ceiling fan's direction of rotation should be set so that air is blown downward (Usually counter-clockwise from beneath). The blades should lead with the upturned side as they spin. The breeze created by a ceiling fan speeds the evaporation of perspiration on human skin, which makes the body's natural cooling mechanism much more efficient. Since the fan works directly on the body, rather than by changing the temperature of the air, during the summer it is a waste of electricity to leave a ceiling fan on when no one is in a room.

In winter, ceiling fans should be set to turn the opposite direction (usually clockwise; the blades should spin with the downward turned side leading) and on a low speed (or a lowest speed the ceiling fan is able to circulate the air down to the floor). Air naturally stratifies - that is, warmer air rises to the ceiling while cooler air sinks. Unfortunately, this means it is colder on or near the floor where human beings spend most of their time. A ceiling fan, with its direction of rotation set so that air is drawn upward, pulls up the colder air below, forcing the warmer air nearer the ceiling to move down to take its place, without blowing a stream of air directly at the occupants of the room. This action works to even out the temperature in the room, making it cooler nearer the ceiling, but warmer nearer the floor. Thus the thermostat in the area can be set a few degrees lower to save energy, while maintaining the same level of comfort. It is important to run the ceiling fan at a low speed (or a lowest speed the ceiling fan is able to circulate the air down to the floor) to minimize the wind chill effect described above.

ceiling fan is a mechanical fan, usually electrically powered, suspended from the ceiling of a room, that uses hub-mounted rotating paddles to circulate air.

Casablanca Fan Co. “Zephyr” ceiling fan from the early 1980s.

A ceiling fan rotates much more slowly than an electric desk fan; it cools people effectively by introducing slow movement into the otherwise still, hot air of a room, inducing evaporative cooling. Fans never actually cool air, unlike air-conditioning equipment, but use significantly less power (cooling air is thermodynamically expensive). Conversely, a ceiling fan can also be used to reduce the stratification of warm air in a room by forcing it down to affect both occupants’ sensations and thermostat readings, thereby improving climate control energy efficiency.

Parts of a ceiling fan

The key components of a ceiling fan are the following:

  • Anelectric motor (see Types of ceiling fans below for descriptions)
  • Blades (known as paddles or wings) usually made from wood, plywood, iron, aluminum or plastic
  • Metal arms, called blade irons (alternately blade brackets, blade arms, blade holders, or flanges), which hold the blades and connect them to the motor.
  • Flywheel, a metal or tough rubber double-torus which is attached to the motor shaft, and to which the blade irons may be attached. The flywheel inner ring is locked to the shaft by a lock-screw, and the blade irons to the outer ring by bolts that feed into tapped metal inserts. Older flywheels may become brittle and break, a common cause of fan failure. Replacing the flywheel requires disconnecting wiring and removing the switch housing to gain access to the shaft lock-screw.
  • Rotor, alternative to blade irons. First patented by industrial designerRon 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 and allows the fan to move freely (which is very useful on vaulted ceilings). Some companies have come up with slight modifications of this design.
    • J-hook (Claw hook) system. a type of mounting system where the ceiling fan hangs on a metal hook, attached to the ceiling. A rubber grommet is used to keep the fan in place and helps avoid vibration on the ceiling.
    • Some fans can be mounted using a low-ceiling adapter, a special kit which must be purchased from the fan’s manufacturer. This eliminates the need for a downrod, and is therefore useful in rooms with low ceiling clearance.
    • In recent years, it has become increasingly common for a ball-and-socket fan to be designed such that the canopy (ceiling cover piece) can optionally be screwed directly into the top of the motor housing; then the whole fan can be secured directly onto the ceiling mounting bracket. This is known as a “close-to-ceiling” mount.

Other components, which vary by model and style, can include:

  • A downrod, a metal pipe used to suspend the fan from the ceiling. Downrods come in many lengths and widths, depending on the fan type.
  • A decorative encasement for the motor (known as the “motor housing”).
  • A switch housing (also known as a “switch cup” or “nose column”), a metal cylinder mounted below and in the center of the fan’s motor. The switch housing is used to conceal and protect various components, which can include wires, capacitors, and switches; on fans that require oiling, it often conceals the oil reservoir which lubricates the bearings. The switch housing also makes for a convenient place to mount a light kit.
  • Blade badges, decorative adornments attached to the visible underside of the blades for the purpose of concealing the screws used to attach the blades to the blade irons.
  • Assorted switches used for turning the fan on and off, adjusting the speed at which the blades rotate, changing the direction in which the blades rotate, and operating any lamps that may be present.
  • Lamps
    • Uplights, which are installed on top of the fan’s motor housing and project light up onto the ceiling, for aesthetic reasons (to “create ambiance”)
    • Downlights, often referred to as a “light kit”, which add ambient light to a room and can be used to replace any ceiling-mounted lamps that were displaced by the installation of a ceiling fan
    • Decorative light bulbs mounted inside the motor housing—in this type of setup, the motor housing often has glass panel sections which allow light to shine though.

Operating a Ceiling Fan

The way in which a fan is operated depends on its manufacturer, style, and the era in which it was made. Operating methods include:

  • Pull-chain/pull-cord control. This style of fan is equipped with a metal-bead chain or cloth cord which, when pulled, cycles the fan through the operational speed(s) and then back to off. These fans usually have three speeds.
  • Variable-speed control. During the 1970s and 1980s, fans were often produced with avariable-speed control. This was a dial mounted on the fan which, when turned in either direction, continuously varied the speed at which the blades rotated—similar to a dimmer switch for a light fixture. A few fans substituted a rotary click-type switch for the infinite-speed dial, providing a set number of speeds (usually ranging from five to ten).
    • Different fan manufacturers used the variable-speed control in different ways:
      • The variable-speed dial controlling the fan entirely; to turn the fan on, the user turns the knob until it clicks out of the “off” position, and can then choose the fan’s speed.
      • A pull-chain present along with the variable-speed control; the dial can be set in one place and left there, with the pull-chain serving only to turn the fan on and off. Many of these fans have an option to wire the light kit to this pull-chain in order to control both the fan and the light with one chain. Using this method, the user can have either the fan or light on individually, both on, or both off.
      • “Vari-Lo”: A pull-chain and variable-speed control are present. Such a fan has two speeds controlled by a pull-chain: high (full power, independent of the position of the variable-speed control), and “Vari-Lo” (speed determined by the position of the variable-speed control).
    • Wall-mounted control. Some fans have their control(s) mounted on the wall instead of on the fans themselves; such controls are usually proprietary and/or specialized switches.
      • Digital control.With this style of control, all of the fan’s functions—on/off status, speed, direction of rotation, and any attached light fixtures—are controlled by a computerized wall control, which typically does not require any special wiring. Instead, it uses the normal house wiring to send coded electrical pulses to the fan, which decodes and acts on them using a built-in set of electronics. This style of control typically has anywhere from three to six speeds.

Old-style and new-style chokes

    • Choke. This style of switch takes varying physical forms. The wall control, which contains a motor speed regulator of some sort, determines how much power is delivered to the fan and therefore how fast it spins. Older such controls employed a choke—a large iron-cored coil—as their regulator; these controls were typically large, boxy, and surface-mounted on the wall. They had anywhere from four to eight speeds, typically four or five. Newer versions of this type of control do not use a choke as such, but much smaller capacitors or electronic circuitry; the switch is typically mounted in a standard in-wall gang box.
    • Solid state variable speed control.These controls, commonly used on industrial fans, can control more than one (up to 15) fans with one switch. 2.5 to 6 amp controls can typically be installed in “gangs” with other solid-state controls or standard light switches or wiring devices, while 8 to 15 amp controls have a large heat sink and cannot be “ganged” with other devices.
  • Wirelessremote control. In recent years, remote controls have dropped in price to become cost-effective for controlling ceiling fans. They may be supplied with fans, or fitted to an existing fan. The hand-held remote transmits radio frequency or infrared control signals to a receiver unit installed in the fan. However, these may not be ideal for commercial installations as the controllers require batteries. They can also get misplaced, especially in installs with many fans.

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