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Old 07-14-2005, 12:46 PM   #1
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Armstrong AC Filter

My 1978 original Armstrong AC is still going fine. The only things I've had trouble with is keeping the filters in place. They would invariably fall out during travel and the filters we got with the unit were pretty minimal--just a flimsy piece of thin foam and they would have a tendancy to get sucked up into the unit and then allow unfiltered air to pass around the sides.

I came up with a pretty BAD looking, but pretty functional solution. One day while I was rescreening windows I looked up at the AC filter and thought, Hmm, what if...

You can see the pics below. I made my own filters using a sandwich of a layer of 3M Filtrete hypoallergenic filter backed by a layer of carbon filter which I found at Home Depot for use in AC's. I ditched the very old thin layer of foam which you could hold up and look right through. That was a very good filter...

I won't win any awards for looks! But, this setup works really well. It stays in place! The filters catch a tremendous amount of dust/dirt. We had it on all week at the Rally and changed the filters because they were really yicked up. The charcoal does a miraculous job absorbing cooking orders which are otherwise kind of trapped in a closed up trailer.

The combination may cut down on airflow a bit, but the fan didn't seem to have any problem sucking air and it spent the entire week in Missouri heat on HIGH! The screen keeps the filter from being sucked up into the AC shroud which would otherwise happen with any filter media offering much resistance to airflow.

I may make some changes to improve the looks, but this setup functions extremely well! Redneck Ingenuity!
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Old 07-14-2005, 12:52 PM   #2
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Dallas, looks great. I have the exact same problem(I don't think my AC is era-correct, my inside piece looks more like yours than other 60's versions). In addition to odors and dust flying around, your condenser or whatever it's called gets gunked up. My "filters" must have failed about a hundred years ago, and my "condenser" is clogged with dirt and causing the compressor to fail- or so the AC repairman says. Hope this filter works!

John
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Old 07-14-2005, 01:35 PM   #3
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John-

Thanks for your reply! Get those coils cleaned off or it could spell trouble $$$! I had the unit ice up on me once during the rally and took everything apart. The coils were hard to get to up on the inside. I did a little cleaning of what I could get to, but it still needs more.
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Old 07-14-2005, 01:43 PM   #4
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Do what I did. Get a ladder, take of the shroud and the sheet metal covering the "guts". Then I got out my shop vac, the one with the 20 foot hose and the brush attachment. I scrubbed 'gently' the fins on both sets of "radiators" (don't know what th official phrases are) with the brush with the vac on. After I got as much as I could see, I then got my air compressor out and blew it out from the other side. For the cooling coils, this will result in dirt in the coach, so tape a trash bag over the unit on the inside. This will blow out a lot of dirt. A LOT of dirt. No wonder it's not working right!

You want to blow from the opposite side from the fan, ie. at the fan, from the other side.

Hit it with the vac again, put it back together and you should be done.

John
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