This topic has been discussed several times. It usually morphs into "But what about the hydrogen?" You could find and read the relevant threads, and be reassured (I hope).
To summarize. There is NO PROBLEM with running the converter while the unit is closed. If there were, TM would not have made a major change a couple years ago to make the power cord accessible while the unit is closed.
When the TM is closed, there is A LOT of empty space inside it, and it would take a whopper of a heat source to cause any appreciable amount of heat buildup. Further, at least in my TM, there is a 4" screened vent hole in the floor behind the converter. The converter has an internal fan for cooling, right near the converter's fan.
You're thinking you wouldn't want to leave the cord connected for too long. I agree, but "too long" is probably two weeks in an older TM, unlimited in newer TMs with a better converter - and heat is not the problem. Older converters, at least, would tend to overcharge your battery if left on for a long time. There is a better converter in 2006 models - I don't know when the changeover took place.
So relax, enjoy your TM, and don't worry - at least about this particular issue.
Bill
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