If you have a ductless wall split air cooling unit, you should be cleaning the filters at least once every 3 months if no more often. Below is an action by step guide on how to purify you wall structure split's (ductless unit's) filters.
Your ductless reverse cycle product can be cleaned as well as maintained very easily by the homeowner. Firstly make sure the power to the product is switched off. Open the lid that runs on 2 hands by taking the front panel towards you. It has to pivot from the upper part. Be gentle and don't force the flap as you might break it.
Lift the face up slowly and gently making use of both hands. The board should lock in to place when it gets on the roof of the pivot point. If not have someone hold the lid open for you.
The filters will be placed just underneath where the front cover was. They're shown here as cream mesh that seems like a fly display screen material. Remove the filters in two actions. First off push them up slightly to push the base with the clip. Next pull the filters down and out of your best portable ac unit (kcafa.org).
Once the screens are out there are 2 methods to clean them. You can often vacuum them or wash them in hot soapy water. Warm soapy water is most effective as it does an even more thorough cleaning job. Be gentle with the filters and examine for virtually any wear and tear. If the filters appear destroyed, speak to the producer to organise replacement air filters.
When clean, leave the filtering system in a dry spot inside your home to dry. Do not place to dry out in the sun as they could warp and you will not be able to find the filtering system back into the air conditioning unit.
Wait until the filters are totally dry out before inserting them back to the ductless/wall split air conditioning unit. Supply the exterior of the air conditioning unit a quick wipe down with a moist (not wet) cloth to eliminate any debris. When this is done, replace the front panel, turn the power on and you're completely ready all over again to make use of your ductless/wall split unit.