Xman Thanks......This is my first mini split, installed for 4 yrs. BTW, parts of my space is still in renovation not to mention the amount of construction in my general area, (45 units in spitting distance, urban life) so airborne stuff is every where. I am learning by DustStorm. I do the filters twice a year! As you documented. I like the additional sealing! snap fit injection molded plastic has issues with air infiltration. regards K
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