I carry a small portable air compressor. This is not the kind you plug into the cigarette lighter, but an actual 110 volt air compressor that can put out 120 lbs of pressure. Like many of my tools it does double duty. I primarily use it to keep the tires inflated and to annoy pesty neighbors, but I also use it to blow out our electronic equipment and appliances. Warning: Always use eye protection when using compressed air this way.A word of caution, compressed air from an air compressor can contain small amounts of water condensation that can damage electronic components. You can filter the air or you can simply allow the electronic components time to completely dry after they have been blown out before turning them back on again. Computers hate dust and are much happier when you blow the dust out.
My friend Hector, A knowledgeable RV technician, told me that RV appliances should be periodically blown out with compressed air. He says that if you only use your RV part time then you should do it once a year, but a full-timer should do it every six months. 
I use a blower attachment on my air hose that reduces the air flow to a small forceful stream. With this I am able to blow out the opening behind the refrigerator, the external heater orifice and the hot water heating tube orifice as shown above. Simple maintenance like this will help keep your appliances working properly and will ensure that any foreign objects, like insect nests, dust and debris are removed. Even if you cover these openings with wire mesh to prevent insects from gaining access, you still need to bow out the dust.
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Also at low pressure for clearing out water lines. Instead of antfreze I blow out he water lines.
Here's another use for a portable compresor capable of generating 100+ psi. We have a TrailAir hitch on our fifth wheel. To top it up to the proper pressure requires the trailer to be hooked to the truck. Manoeuvering both truck and trailer near the air line at a service centre is usually impossible and its likely the pressure available is insufficent anyway. Using our compressor, I can top up anywhere and anytime.
A question: I've been searching for an air-compressor but have heard that many of the models designed for 'home use' simply will not serve to inflate vehicle tires, etc. Any good suggestions out there?
Although cans of compressed air can be used on the computer. Only use it on the surface. Do not use it on the fan or cooling vents. Reason: Electrostatic Discharge will result from the blast of air and could potentially reach CMOS chips inside the computer and either distroy them or cause a latent failure. (Meaning it will fail a day, week or a few months later). While working at Motorola, I have witnessed a test showing considerable static buildup from rushing air.
Add Air Bag Over Loads to the list of uses for a portable air compressor.
Where do you get a blower attachment for the air compressor hose. Good ideas.
JL Michigan
Funny. just started doing this on our last trip.could not find the hand pump for the bikes so i got the portable compressor out. I used it for the fridge and blowing the dust out of the screen door. Also, on some Rv's there are air shocks that you can adjust as well. they are under your rig. It will help with the handling when you drive. Check your handbook for the right air pressure.
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