In the spirit of the 'RealRedRaider forums' overkill style that I've come to love and appreciate I've decided to step up my fans, and with them my fan controller...
I emailed Sidewinders for a quote on the below just a few moments ago:
[edit]: I revised my order - swapped the AFB1212SHE fans for AFB1212GHE models instead (the difference between the two is 151.85 vs 240.96cfm)[/edit]
The thermal material and cleaner is for another unrelated project.