HEPA filters to replace foam?

[lajitasgal]

Hi all. We have a 3121 RL (year 2019). On a recent trip I removed the foam filters from the air intakes in order to clean them. I'll try to attach a pic of the filter and the grid that goes over it. Per usual, it was kind of a pain to clean; the dirt and muck prefers to stick even when the foam is rinsed under running water, and the foam tears easily if I get too aggressive with it. I'd like to replace the foam with HEPA filters, since they're a lot easier to clean. (We had them in a previous trailer.) But I don't want to create an obstruction in air flow. Have any of you successfully gone to HEPA filters?

 

[Bourbon County]

HEPA filters would be the worst possible thing to add. First of all they might be labeled "HEPA", but a true HEPA is going to be 5+ inches thick and the MERV rating should be 17. Secondly, don't do anything to further restrict the airflow on an RV that are usually very deficient to start with. The blower can only output the amount of air it can take in. I personally use these:

https://www.amazon.com/FilterTime-A...27365525&sprefix=rv+air+filte,aps,225&sr=8-14

You'll have to cut to size using the original for a template. they're made of polyester and I put mine in the washer on gentle cycle. If you want a bit more filtration, spray them with Pledge when installing them. These filters job is to keep large particles out of the evaporator coil, cleaning the interior air is just a side effect.

If you feel you need additional interior air filtration, get a floor standing model, they make them rated for HEPA.

 

[lajitasgal]

This is why I love these forums! Thanks for the leads & the link.

 

[Kyle and Lisa]

You can buy replacement a/c padding at a hardware store and make your own.

 

[c2itcliff]

Filter material also available at Walmart. Look for the "RV" section in the automotive department.
https://www.walmart.com/ip/446598779

 

[Rnjmurray]

Replacement filters

Go to Walmart you can buy AC filters. Then get some cardboard and make a template. Then cut a bunch of filters. And just keep replacing them