AC_1_IMG_0357

All RV air conditioners with ceiling plenums have a provision for removing the return-air grille and the filter for cleaning. Check the owner’s manual for specific procedures. Here, the grille in a Coleman-Mach unit is gently pried off.
Once the grille is removed, the filter is exposed. Dust on this unit is visible, and even this relatively small amount is worth cleaning to keep the air conditioner functioning properly.

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