Air conditioning

[John White]

Sparky,

So you have a vent making too much noise when air is flowing into the room. Yes? I don't understand what you mean by the "4 vents". Do you mean you have one grid (register) with 4 directionals?

Regardless, I would just remove it altogether before doing anything else. See if this solves it

[sparky323]

Not exactly.. What we're hearing is the the air flow down the duct itself due to the amount of air flow. The fans have already been turned down to 65%, and can't be turned down anymore without affecting the cooling to the rest of the vehicle. I should also clarify that this is a mobile truck. The air conditioners mounted on the front blow cool air down a wide open air duct in the ceiling that is the width and length of the truck. At the back of the vehicle where audio is located are 4 ceiling mount grates to spill air into the room.

[John White]

Sorry, I can't picture this at all. Four vents?, moving walls?, wide open air duct?, mobile truck? Can you post a photo?