How do sash windows work?

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How Do Sash Windows Work?
Sash windows are based on a pulley system. They
are made up of numerous parts that are used for
the installation and function of sash windows. It
has sash weights, top bottom rails as well as
cords that make sash windows to perform
effectively.
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Take a look at the terms of sash windows that
make them effective, quick and easy.

• There's a top horizontal rail of the window in
  the sash windows
• Then comes a sash cord which works on a pulley
  and is helpful to hold weights.
• Then there are weights that around sash windows
  that need to be hanged around located on either
  side of the windows
• Sash windows also have parting beads that are
  fitted under the box frame which separates both
  upper and lower sashes. 
• Whereas, the horizontal framing helps to put both
  the sashes together.
• Sash windows also have a horizontal sill that is
  around the internal base of the sashes which
  helps the water to flow away so that it can
  prevent leakages and rots. 
• What's more? It also includes a pair of weights
  that are located to balance each side of sliding
  sash

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• Types of Sash Windows You Should Know?
• Usually, sash windows are divided into two types
• Traditional sash windows Modern sash windows
• Usually, traditional sash windows include windows
  from the Victorian era that were famous and used
  to be owned by royal families of the old times.
• Whereas modern sash windows include numerous
  different types of sash windows which have a
  modern touch - one can include triple glazed sash
  windows, uPVC Sash windows, box sash windows,
  flush sash windows, double glazed sash windows
  and a lot more into them.

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• Concluding, numerous homes in London are counting
  on sash windows today be it modern or
  traditional. Because they work extremely
  efficiently and are perfect to keep your
  residence, safe, secure and aesthetically
  pleasing. 
• P.S. If youre someone looking for a sash windows
  company in London who is reliable, efficient and
  cost-effective, you should count on SJB Sash
  windows specialists  - they are leading in the UK
  and can help you with the bespoke range that fits
  your needs and requirements.