Thermostats for node 0?

["rb_ziggy" <richard.boreham@xxxxxxxxxxxx>]

I know this has been discussed before and had a look at the archives
but couldn't find anything specific on this...

I've been running Node 0 (inc server and amplifier) in the loft and
its getting on to summer so I need to provide some cooling. The
equipment is in a home made cabinet which I want to ventilate.  My
plan was to use an in line bathroom ventilator unit in 'reverse
mode' (i.e. sucking cooler air from under the soffit and venting
into the loft).  This bit is fine.

But I need a thermostat and I can't find a suitable one. It needs to
be 230v and capable of 'make on rise' plus I think it needs to
trigger somewhere around 30-40 deg C.

Most room thermostats seem to a)'break on rise' and b) max out at 30
deg C. The only thing close (from CPC) looks to be a cylinder
thermostat designed to place on pipes or a cylinder itself which has
a 20-90 deg range and a 'm o r' option (an Erebel unit). This looks
ok but it says its main use is for wide fluctuation ranges (i.e. a
hot water tank)and had a 7 deg switch span (I guess hysterisis).

Has anyone done anything similar and have a recommendation for a
suitable thermostat?

Ideally I want something simple that can just be plummed directly
into the fan powersupply. (I can't be faffed with anything linked
into wider HA control but I'll probably run the whole fan spur via a
X10 AD unit so I can turn the whole lot off when we are away and the
server is powered down.)

Cheers

Richard