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A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment. High capacity, heavy duty casters are used ...
Typically, they are built to be assembled modularly. They are often used to provide varying levels, to make a show more visually interesting. They are also used to separate areas on stage, and as seating bleachers. This is in contrast to scenery wagons, which are mobile platforms that are supported by casters instead of feet.
Consequently, it may be difficult or impossible to move a wagon that has a large number of swivel casters when the casters are unaligned. As a result, rigid casters are preferred for larger wagons, which typically require a proportionally higher number of casters. [2] Air casters are sometimes used in place of rolling casters. These require ...
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Billet casters cast smaller section sizes, such as below 200 mm square, with lengths up to 12 m long. Cast speeds can reach up to 4 m/minute. Rounds: either 500 mm or 140 mm in diameter; Conventional beam blanks: look similar to I-beams in cross-section; 1048×450 mm or 438×381 mm overall; Near net shape beam blanks: 850×250 mm overall
This one from RENPHO is for larer rooms of the home and can handle up to 600 square-feet of space. Because it's a true HEPA filter design, it eliminates 99.97% of allergens, smoke, dust, pollen ...
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