REQ: specification of fan size

On Tue, 13 Apr 2004 13:17:41 +0100, CrackerJack
wrote:

Does anyone know what the actual specification is of the physical
dimensions of fans to be found in a PC?

There are fans whose nominal size is 60mm, 80mm, 92mm and 120mm.

This size seems to be the outer dimension of the physcial unit.
The mounting holes are a bit less apart from each other. Does
anyone have the correct figures (with any tolerances) for these
fans?

By the way, are these dimensions a metric equivalent to dimension
which were originally specified in inches?

Is it to take a strobescope mounting too?

:-)

Seriously though measure from hole to hole for the mount points. Of
course it depends on which fan you are replacing. Rear case fans are
often 80mm.

On Tue, 13 Apr 2004 15:38:50 +0100, Piotr Makley
wrote:

Bagpuss wrote:

Does anyone know what the actual specification is of the
physical dimensions of fans to be found in a PC?

There are fans whose nominal size is 60mm, 80mm, 92mm and
120mm.

This size seems to be the outer dimension of the physcial
unit. The mounting holes are a bit less apart from each
other. Does anyone have the correct figures (with any
tolerances) for these fans?

By the way, are these dimensions a metric equivalent to
dimension which were originally specified in inches?

Is it to take a strobescope mounting too?

:-)

Ha ha!


Seriously though measure from hole to hole for the mount
points. Of course it depends on which fan you are replacing.
Rear case fans are often 80mm.

If I measure from hole to hole then I get rather less than the
nominal fan size.

I know it may be teaching you to suck eggs, but am I right to assume
you are measuring center to center of the holes diagnoally across the
fan?

I sometimes need to buy fans to unusual heatsinks and when I work
out possible anchor points on the heatsink then I need to know the
correct distance between the holes of a fan I might fit.

Its worth having a look at somewhere like Maplins (if one is near by)
they do coolmaster fans. At the minimum you can get them out of the
boxes and measure across the screw mount points.

CrackerJack wrote:

Does anyone know what the actual specification is of the physical
dimensions of fans to be found in a PC?

There are fans whose nominal size is 60mm, 80mm, 92mm and 120mm.

This size seems to be the outer dimension of the physcial unit.
The mounting holes are a bit less apart from each other. Does
anyone have the correct figures (with any tolerances) for these
fans?

By the way, are these dimensions a metric equivalent to dimension
which were originally specified in inches?

http://www.nidec.com/fanpdfs/c2003_2425.pdf
http://www.nidec.com/fanpdfs/c2003_3132.pdf
http://www.nidec.com/fanpdfs/c2003_3536.pdf
http://www.nidec.com/fanpdfs/c2003_4243.pdf