on today's Tech twiki we're going to show you how to determine what kind of
fans are compatible with your case or cooler and how to install them figuring
out which fan is compatible with your case if you have an aftermarket case as
a snap check the manufacturer website look on the side of the box or check the
manual it'll tell you which mounting points correspond to which fan sizes if
you don't know what kind you need then it becomes a little bit more challenging
grab a measuring tape and you can either take an existing fan that's the same as
the one you're looking for and simply measure across the fan not diagonal to
find out what size it is they come in standard sizes 80 mm 92 mm 120 mm and
140 mm are the most common ones or if you don't have access to a fan you can
simply find the mounting holes in the case measure from the middle of one hole
to the middle of another hole again not diagonally and look for a measurement
that's slightly lower than the size of a standard fan Mount so for example a 120
mm fan has holes that measure from Center to Center about 5 mm in general
you want the air to flow from the bottom front of your case to the top back this
ensures adequate cooling for all the components inside but and don't be
embarrassed if you've wondered about this not everyone knows how to tell
which side of the fan the air comes out of and which side is an intake so on
most fans it's actually labeled if you look closely there's one arrow that
indicates the direction that the blades are spinning and another one that
indicates which way the Air's coming out but don't worry about it too much if
your fan isn't labeled because all you have to do is find the pieces of plastic
that are holding the middle Hub that is where the motor's situated and in
general the fan will actually be blowing air out away from that side so if you
wanted to use it as an exhaust fan you just have the sticker pointed towards
the outside of the case and it would be blowing in that direction installing a
fan is simple in most cases you're actually just going to use four fan
specific screws they're specially threaded so they actually cut into the
plastic of the fan you just screw those in and they're attached to the
however there's a slight disadvantage to using screws or what's called A Hard
Mount and that is that vibrations from the fans particularly lower quality fans
can be transferred to your case if you don't want those vibrations you can use
rubber isolator mounts many highquality fans come with them already but you can
also purchase them separately that way the spinning motor of the fan actually
is in no way in direct contact with the metal of the case reducing the risk of
vibrations until you plug the fan into the power supply it won't get any power
so there's a couple different ways to do that this one right here is a four pin
Molex it has two wires one for positive
one for negative that's it you can't monitor the fan and you can't control it
because you're usually going to be plugging that directly into the power supply next we have a three pin fan
connector this can be plugged into the power supply using an adapter which will
be included with most highquality fans or you can plug it into your motherboard
where you can use that third wire to sense the RPM and give you a warning if
something goes wrong and you can actually adjust the fan speed using
voltage control which is a less sophisticated way next we have a four
pin pwm fan connector this one adds an additional pin that is dedicated to just
controlling fan speed most newer motherboards will use these
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