[BillA]

"but for the lesson that you need to qualify what exactly you mean by "efficient" or "perform better"."

yet you used a ear also, no ?

"Push resulted in lower c/w than pull."
my exp as well, one could include the fan mfgrs also

if the strut related noise is the greater portion, flipping it (on a shroud) contributes what ?
not saying there is no difference, just sorting through the 'fineness' of an ear managing such