Just sent Martin a pm about these

.......if you don't mind making an adapter the flat sides might make it possible to push them together on a rad

http://www.onlinecomponents.com/buy/...TS/AFB1524L-A/

or

http://www.onlinecomponents.com/buy/...TS/AFB1512M-A/

Edit: more on those http://www.delta.com.tw/product/cp/d...2x150x25mm.pdf

Thinking about use on a 140mm rad but all this testing has given me the bug to find a fan that will overlap the performance of the ap15's and the afb1212

So, shroud makers ...any thoughts