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I run 4 filters two on the door to the a/c closet one washable to trap dirt dust and hair one super disposable #9 the highest filter for smoke pollen ect
and the same on the bottom of the a/c unit one washable one super #9
and the fan cage veins still gets caked with dust and needs cleaning !!
I suspect the fan is your problem limiting air flow and the motor over speed
but with the build up in the vents a system cleaning is needed or the improved flow
will quickly be moving stuff on the fan again
that would be my first step clean the fan vents and evap coils for better air flow
never suck under house air inside open the system to inside air if you must
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