Your RV AC filter serves the important purpose of protecting the inner workings of your rooftop air-conditioner.
Yes! RV air conditioners have come with filters since the dawn of ACs in RVs.
Your RV air filter generally sits under the AC vent cover on the inside of your RV. To access the filter(s), simply unscrew your entire AC vent cover and drop it down.
You should change your AC filter after 150-400 hours of use. That’s a wide time range, however. Where you fall will depend on the areas you camp in.
You can buy filters that will last longer than your stock variety. Also, you can upgrade to a filter that will remove odors, allergens, and more from your air.