A/C Filters

Richardrky · 11-13-2010, 07:08 AM

I have two roof mounted Dometic Duo-Therm Air Conditioners Model 620515.321 on my 2004 Kountry Star. I have read the post about cleaning the evaporator coils and the air filters inside the coach.
I can't find any filters. The post shows filters in the return air vents (round). I don't have any. Are they missing?
If I need these filters can anyone tell the part numbers and where I may buy them.

Thanks

bigskymt · 11-13-2010, 08:09 AM

The filters are thin foam material. You should be able to get a suitable substitute at Depot or Lowes. I saw them at Camping World also. The louvered vent removes by pulling straight down. At least that's the case in our '04 KSDP.

GaryKD · 11-13-2010, 04:05 PM

Newmar has them in stock. This is one item that was reasonably priced. You'll need one for each return vent.

RVhauler · 11-13-2010, 09:47 PM

Newmar sels them for less than a dollar each. They are a very thin porous foam material. As suggested you can purchase material and cut them to fit. Or contact parts dept at Newmar

TheRVGuy · 11-14-2010, 04:57 PM

You might want to consider 2 sets that way you can change them, wash set 1 while set 2 is getting used, etc. If you are operating the A/C regularly you will probably need to change them ever couple of weeks or so.

Mike

RVhauler · 11-14-2010, 08:52 PM

The RVGuy has the right idea. I have a extra set and change them and then wash out the dirty set. Cuts down chances of breaking the louvres. They can not be bought seperately.

palehorse89 · 11-15-2010, 03:38 AM

i cleaned mine this weekend and for some reason i was missing one filter in the bedroom,my wife suggested that i cut a dryer sheet to fit and try it as it will not only filter but smell good. worked great!

H. Miller · 11-15-2010, 05:31 AM

Lowes or Home Depot will have a roll of blue "fiberglass filter material" in the a/c filter area. My roll is 3' X 20' and it says 1" thick however more like 1/2". That easily "squeezes" to 1/8" thick when installed.
Just cut 10 filters last week as we throw them away (wouldn't wash easily)
Have used this roll for 5+ years and still over 1/2 remaining.

**"007"** · 11-15-2010, 07:12 AM

A foam filter preferably 1/8" will filter air through easier than a dry sheet which has a tighter weave.
You want air to move as fast as possible for quicker cooling.
More information in keeping your AC system in top condition supplied by Oemy.

Richardrky · 11-15-2010, 10:27 AM

Thanks for all the good information. I think I'll try the Lowe's route because I can imagine what Newmar's shipping cost will be.

joelyn5 · 11-15-2010, 12:02 PM

Tip for removing the round louvered vents to replace the filter: twist the vent as you pull down. By doing that you're less likely to break the plastic things that hold the vent into the ceiling. I got this tip from Jeannie at the Newmar parts store---and it works.

Richardrky · 11-29-2010, 10:53 AM

I started to install the filters in my air conditioning vents this weekend by removing the plastic vent cover (no problem). My question is - what's holding the filter in place? It appears that it may be sucked into the ductwork if it gets very dirty and air flow is restricted. Since my unit has no filters, I have nothing to compare anything to. Do the filters just lay in the round plastic vent cover and friction keeps them in place?
Thanks

DandS · 11-29-2010, 11:21 AM

Richard - There is a 3 leg support for the center snap for the vent grille that the filter lays up against. It is essentially trapped between the support and the grille.