A/C Filter Replacement

dadmomh wrote:
The furnace in our ROO - Suburban, I think but can't be sure, did not have a filter in the air return, only in the ceiling unit. It was a sponge-type material. I just took it our 3 or 4 times a season, gave it a squirt of Dawn, squished it around and rinsed and dried. I recall someone who used a filter in the return even though the manual specifically said not to....I'd be leery of doing that. Our return on the ROO was under one of the dinette seats and it was a quick job to lift the plywood and vacuum it out. With our TT, it's under the cabinet below the kitchen sink, even easier to get to.

OP is talking about the filter in air return for his A/C unit...not his furnace.

RV furnaces don't use filters.

What brand of AC doesn't have a filter? I would steer clear of that unit.

The furnace in our ROO - Suburban, I think but can't be sure, did not have a filter in the air return, only in the ceiling unit. It was a sponge-type material. I just took it our 3 or 4 times a season, gave it a squirt of Dawn, squished it around and rinsed and dried. I recall someone who used a filter in the return even though the manual specifically said not to....I'd be leery of doing that. Our return on the ROO was under one of the dinette seats and it was a quick job to lift the plywood and vacuum it out. With our TT, it's under the cabinet below the kitchen sink, even easier to get to.

aepowell wrote:
I have never seen an air unit without a filter. My filter is filthy after just two campouts. Those thing suck a lot of air usually dusty air.

I did get a manual by writing to Dometic (great customer service btw) and it does call for a filter. I have one in there now. I also used a shop vac with brush attachment to vacum the cooling fins on the coil. Man, was that thing dirty.

I have never seen an air unit without a filter. My filter is filthy after just two campouts. Those thing suck a lot of air usually dusty air.

jpetrey wrote:
Walmart foam filter

Thanks, I'll check out my local Wally-Mart

dadmomh wrote:
Oops, I didn't thoroughly read the post above....you should definitely check with Dometic on a filter for that area. Some folks have gone ahead regardless and used one, but believe it would void any warranty you might have if adding one caused a problem.

I haven't been able to find any manual on this model. Maybe I'll send an email to Dometic. The one inch material I have in place is not tightly woven at all, so air is going through it like it should. The unit is not under waranty anymore so no problem there. And from the amount of dust that was on the fins inside the unit, it cant be any less efficient with the filter installed.

Is this filter for the air return or for the part of the unit that fits into the ceiling. Some manufacturers say do not use a filter in the return air compartment, so maybe check your book, if you have one. The filter in the ceiling part of our ROO was only a sponge-type material, maybe 1/4" thick or so. If you can't find any manuals on your specific model, suggest just contacting Dometic directly for info.



Oops, I didn't thoroughly read the post above....you should definitely check with Dometic on a filter for that area. Some folks have gone ahead regardless and used one, but believe it would void any warranty you might have if adding one caused a problem.

Old-Biscuit wrote:
That woven material is 1" thick.........does it fit in the in return on your A/C Unit??

The thin foam material is what is typically used.

Yes, I cut about a 10x9 piece and used the tabs on the back of the return grill to hold it. It fits like a glove.