There's also Alphacool that has launched fans with a metal frame, but until someone takes them for a spin (pun intended) an reviewa them, we don't know if that helps or is kind of a gimmick.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.