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The dimensions and mounting holes must suit the equipment that uses the fan. Square-framed fans are usually used, but round frames are also used, often so that a larger fan than the mounting holes would otherwise allow can be used (e.g., a 140 mm fan with holes for the corners of a 120 mm square fan).
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).
Derived from the EEB and ATX specifications. This means that SSI CEB motherboards have the same mounting holes and the same IO connector area as ATX motherboards, but SSI EEB motherboards do not. SSI MEB: SSI? 411 × 330 mm (16.2 × 13 in) Created by the Server System Infrastructure (SSI) forum. Derived from the EEB and ATX specifications. microATX
Usually, the standoff has a #6-32 UNC male thread on one end which screws into a threaded hole in the case or motherboard backplate and a #6-32 UNC female thread in the other end which accepts a screw to retain the motherboard. Less often, the standoff has a female thread in both ends and a second screw is used to attach it to the case.
The four mounting holes in a Mini-ITX board line up with four of the holes in ATX-specification motherboards, and the locations of the backplate and expansion slot are the same [2] (though one of the holes used was optional in earlier versions of the ATX spec). Mini-ITX boards can therefore often be used in cases designed for ATX, micro-ATX and ...
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With the advent of practical steam power, ceiling fans could finally be used for ventilation. Reid installed four steam-powered fans in the ceiling of St George's Hospital in Liverpool , so that the pressure produced by the fans would force the incoming air upward and through vents in the ceiling.
TO-126: Plastic-encapsulated package with three leads and a hole for mounting on a heat sink; TO-220: Through-hole plastic package with a (usually) metal heat sink tab and three leads; TO-226 [23] TO-247: [24] Plastic-encapsulated package with three leads and a hole for mounting on a heat sink; TO-251: [24] Also called IPAK: SMT package similar ...
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