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Nice rig you've got there......There are at least a couple of solutions to your fan noise problem.
First, you should understand just why that fan is there and what it's purpose is. The refrigerant used in an RV ridge is a mix of liquid ammonia, hydrogen gas, water and sodium chromate (a corrosion inhibitor). When the refrigerant mix is heated, it rises up the boiler tube and goes into the condenser, where the ammonia returns to a liquid form and it's reaction with the hydrogen begins the cooling process and subsequent heat transfer from within the fridge cabinet.
If the condenser is too hot (from proper lack of air flow across it), the process is inhibited and the fridge will not cool properly. Airstream places the fan in the rear baffle section of the fridge to speed this air fow and enhance the efficiency of the condenser and with it....the overall cooling capacity of the unit. Unfortunately, this is a band-aid that has no true effect on the ventilation process! There are very specific requirements for the design of the rear compartment of the fridge, and from what I've seen, these are not exactly to spec...based on what Dometic requires.
A better design would be to have a fan blowing UP from the bottom of the compartment and then another blowing OUT from the top. A solid alternative is to add a Snyder's Refrigeration kit to your unit which directs air flow directly across the condenser, but you could also just add....or have added a simple switch that will turn the fan on/off.
You really don't need a fan boost unless you are experiencing warm fridge temps (above 42*F) or you plan on camping in very hot climates.
Hope this clears things up a bit!
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