Indeed, the added length of another fan in the typical ThermoChill-esque way (ie: our larger fan spacing between the fans) results in a PA120.4 of current format being too big for installation in any case, hence we're in no rush to release them until there is a clear and strong demand for such.

There are other formats that are being investigated that are more accomodatable within current popular cases that would offer similar (if not better) performance... but the majority at the moment are happy to go with multiple radiators and (relatively) simple fitting than have to find something to accomodate a radiator that would total 556mm(ish) length. One-off's and limited runs are simply not economically viable for us to produce. Work is in progress, when there's any news or updates I'll let ppl know... but until then, PA120.3 is our largest format radiator and will remain so...