[bestgenman]

Just so you are clear on the generator cooling system, I believe you have a horizontally oriented radiator with a squirrel cage blower mounted on the top side in a separate compartment.  The fan sucks air in through a louver on the door usually and exhausts air downward underneath.  The cfm requirement is enough to keep the coolant temp at a usable level under full load conditions.  The air flow does nothing to keep the engine / generator compartment cool.  That function is provided by another squirrel cage fans or pair of fans considerably smaller than the radiator fan.

Perhaps the radiator fan has been changed and is the wrong fan which would attribute to the higher noise level.  The fan as installed when new are typically not that noisy.  As to redirecting the output, maybe some sort of canvas boot could be used but that would always be a hassle to install and then remove when traveling.  The blowing sand is certainly an issue and the suggestion of a mat is another perfect guru idea.

I think I have the fan number from #785 (which was a 20KW PT) when I replaced it. if you need it PM me and I'll hunt it down.