Mile High wrote:
We have the rooftop Mach 8 low profile ACs and they are terrible noisy (my chief complaint on the whole rig). It's not the airflow, they are just mechanically noisy on the roof. I've done the fan upgrade but that just made the outside somewhat quieter. My previous Dometic Briskair's were far quieter.
Do your units have the original 6 blade fan? If so they can be upgraded to the new and much quieter 3 blade fans. The 3 blade design moves more air and is considerably more quiet that the 6 blade one.
The part number for the upgraded fan kit is 1472D5041. It includes a 3 blade fan and a bracket. The bracket keeps the exterior shroud from collapsing on the fan blade. If you get new fans be sure they are revision D. They had some others out before this revision that would self destruct.
I called the AIREXCEL technical hotline for another problem and they sent me 2 of these kits at no charge.