Dometic Penguin AC intake air whine

[walt2137]

I installed a new Dometic mod# 641516 15,000 AC about a month ago to replace my 13,500 heat pump and it has a pretty loud whine that is coming from the air intake (loud enough that you have trouble staying up front or watching TV up front) I have been into the fan intake side cant find anything, I have had it at a dealer he could not find the trouble and I have pull it off two times double checking the installation cant find anything. I called Dometic and they acted like they had never heard of the problem since they redesigned the old metal fan housing to the new plastic housing, I found out that was not so as this has been going on for a while and 3 others on one of the forums has the problem and one had 3 units installed until he found one that whined low enough that he could live with, Is anyone here having this problem? It makes the noise on all three speeds and as loud on low as it is on hi speed .

[RJay]

Walt,
I don't know if this will help but you may want to change out the squirrel cage fan to a metal one.

[walt2137]

Rjay I probably didnt make my self clear , the Plenum is whats plastic the fan cage is still metal. The redesigned plastic Plenum is the problem, on the old style it was metal.
Thanks anyway for the come back.