There is an opening on one side of the bed already in my model, but it's the on the end furthest from the inverter. My ducting literally lays against the inverter (and the converter for that matter, now that I look at it). A very quiet fan, like you said, might be a good solution. Would have to pretty quiet for some folks though. I had just enough hearing loss from being in too many engine rooms in my early Navy days so the inverter/converter fans probably wouldn't bother me, but Joni is an amazingly light sleeper. Don't really want any cranky people in a confined space.