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Old 08-10-2022, 07:09 AM   #1
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AC Foam Filters

I have been routinely dropping the AC vent cover and cleaning the foam AC return filters. They are always dirty however they are pretty course and I suspect they let allot of junk pass. Has anyone found a suitable replacement that might even have some embedded carbon? On Amazon I found one that could work with some modifications however it was 7 inches round. Not to interested in making the whole larger.
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Old 08-10-2022, 07:14 AM   #2
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Starting in post #7 here https://www.irv2.com/forums/f103/hin...er-548784.html filter's being discussed.
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Old 08-10-2022, 09:16 AM   #3
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Quote:
Originally Posted by Chargersrt8 View Post
They are always dirty however they are pretty course and I suspect they let allot of junk pass.
One of the things I miss most about having a residential style basement AC in my RV is simply changing a 16x20 house furnace filter vs pulling down a bunch of breakable vents and cleaning little individual foam filters.

I too thought the coarseness would let a lot pass through, but when I had to change the gasket on one of my ACs last year I was pleasantly surprised at how clean the air intake plenum was and the intake side of the ACs internals. So I put that concern out of my mind.

But, you could always just buy a roll of a tighter foam and cut out a set of the filters, if you are concerned about it. Downside might be airflow restriction and lower cooling flow?
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Old 08-10-2022, 03:40 PM   #4
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https://www.amazon.com/dp/B099X5GZV8


Current amazon link. Cheaper than the RV Upgrade store right now.
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Old 08-10-2022, 03:55 PM   #5
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The other downside with reducing the airflow with denser filters is the freezing up of the evaporator.

Surprisingly those little foam filters work quite well.
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Old 08-10-2022, 05:07 PM   #6
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Its an AC not an air purifier.

AC filters are there to stop particulate from clogging the coils, and the foam filters do exactly that.

I would not invest in a "premium" filter on any AC unit.
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Old 08-10-2022, 05:25 PM   #7
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Some, but not all Walmarts have replacement filter material for RV ACs in the RV aisle within the automotive section.
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Old 08-11-2022, 06:00 AM   #8
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www.rvair.com

I have been using their filters for over two years now. They work as advertised. We use the charcoal filters mainly because of our dog. Although the system on our coaches are not air purifiers, these filters contribute significantly to better air quality as well as a significant reduction in dust inside the coach.

These filters are not washable and need to be replaced every 90 days if you are full time or once a year otherwise.
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Old 08-11-2022, 12:50 PM   #9
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NCC-1701A raised my concern, restricting airflow. Restricting the airflow is another reason given by manufacturers for cleaning and replacing filters regularly in a stick-n-bricks HVAC system. You could shorten the life of the AC by making the unit work harder and run more often to cool the RV.
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Old 08-11-2022, 01:49 PM   #10
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Originally Posted by Rev. Roy View Post
NCC-1701A raised my concern, restricting airflow. Restricting the airflow is another reason given by manufacturers for cleaning and replacing filters regularly in a stick-n-bricks HVAC system. You could shorten the life of the AC by making the unit work harder and run more often to cool the RV.
Dirty air filters at the evaporator actually lighten the load on the compressor. It is dirty condenser coils that raise head pressures and shorten compressor life.
Additionally, those dirty air filters are restricting air available for the blower to perform work in moving through the evaporator. So, in reality, dirty air filters will not lessen the life of an AC unit. In fact, the energy consumed as filters become dirty will lessen.
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