gentlegreen
I hummus, therefore I am ...
I'm going to say straight out that I may have misunderstood you - but in case I didn't, it sounds like a very bad idea to me to put a fan heater anywhere near any computers, which should ideally be in the coolest place available and well ventilated for cool/cold airflow.
I get worried if my case temperature hits 30 degrees - at which point the case fan kicks in.
My comfortable temperature is well under 30 degrees - the PC itself will supply some of the heat - perhaps about 50 watts.
The shelf has plenty of ventilation.
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