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Old 07-19-2018, 03:45 PM   #1
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2006-Dometic A/C- 579 Brisk Air

I recently bought my first pop up with one of these A/C units . I pulled the intake vent today to find no air filter. When I looked inside I see cables and above that at a 90 degree angle, I see the delicate fins that air passes through. No filter.
I feel they must have one.
But i saw no recessed area to fit a filter.
Upon reading the installation and operating manual, the only mention of a filter is “periodically remove the air return filter located above the removable panel in the air box. Wash the filter with soap and warm water, let dry and then reinstall.”
I googled for half an hour and came up with nothing.
Anyone have one of these and can help me out?
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Old 07-19-2018, 04:12 PM   #2
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Originally Posted by Kg4izw View Post
I recently bought my first pop up with one of these A/C units . I pulled the intake vent today to find no air filter. When I looked inside I see cables and above that at a 90 degree angle, I see the delicate fins that air passes through. No filter.
I feel they must have one.
But i saw no recessed area to fit a filter.
Upon reading the installation and operating manual, the only mention of a filter is “periodically remove the air return filter located above the removable panel in the air box. Wash the filter with soap and warm water, let dry and then reinstall.”
I googled for half an hour and came up with nothing.
Anyone have one of these and can help me out?

Normally, on the bottom of the A/C is an "air return box" with a grill and filter. The filter is the grey area in this diagram.
Service kit return air grille for Brisk Air ADB


Here's a pic of a typical air return box with the controls.
https://factoryrvsurplus.com/product...ir-3107206-07/


A lot of us make our own filter by purchasing a package of window/room air conditioner filter foam at Lowes.
https://www.lowes.com/pd/Frost-King-...RoCnPsQAvD_BwE
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Old 07-20-2018, 11:36 AM   #3
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Thanks for the reply.
I see you found the front grille and even the inside panel, but I still cannot find a filter anywhere.
In fact there does not appear to be any area inside the grille that would fit an air filter, homemade or otherwise.
Can you confirm it does use an air filter and if so ... where and how?
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Old 07-20-2018, 12:42 PM   #4
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Thanks for the reply.
I see you found the front grille and even the inside panel, but I still cannot find a filter anywhere.
In fact there does not appear to be any area inside the grille that would fit an air filter, homemade or otherwise.
Can you confirm it does use an air filter and if so ... where and how?

I suspect you are expecting a big filter like a home uses .... RVs have a foam filter that is about the thickness of 2 paper towels. The filter is usually just sandwiched between the grill and whatever is behind the grill. Because it is not very efficient you wash or replace it every month or so. Mine (10 of them) are similar .... just circular foam discs about 1/16th inch thick.
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Old 07-21-2018, 07:14 AM   #5
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Perhaps the previous owner removed his for replacement and never returned it.
Are you saying get a sheet of foam filter and just lay it inside the area on top of that white grille?
I have run it for 6 days now with no filter in it.
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Old 07-21-2018, 07:38 AM   #6
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Perhaps the previous owner removed his for replacement and never returned it.
Are you saying get a sheet of foam filter and just lay it inside the area on top of that white grille?
I have run it for 6 days now with no filter in it.

not exactly .... you need something to keep the foam from getting sucked upward. That's typically a plastic or metal grid.
https://www.lowes.com/pd/Frost-King-...xoCoGQQAvD_BwE


https://www.storesupply.com/pc-12194...BoCsTYQAvD_BwE


Alternatively, you can cut the foam bigger than the grill and press it in place so it holds the filter (wrapped around the edges) and then trim the excess with razor blade.
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Old 08-07-2018, 09:29 AM   #7
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I found a cut your own backing and filter and installed it this past weekend.
Thanks for all the input.
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