In the ceiling of our motorhome are a series of register and return vents for the three ceiling AC units; the air is sucked in on the right side, cooled (or heated), and blown out the left side:
Here’s a closer view of one of the intake vents:
Looking on the reverse side, you can see that each of them includes a foam filter to catch dust:
These filters need to be cleaned every few months. But we decided to try some replaceable filters from RV Air, that should do a better job than just a thin bit of foam:
A comparison of the new and old filters:
An old filter, showing the collected dust:
The new filter installed:
The vent back in the ceiling:
About half of the ceiling vents are a different kind, for some reason:
These ones are attached via a clip in the middle, so need a different style of filter:
We’ll see how these new filters perform; I think they’ll be an improvement.