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The dark shit was near the metallic filter. You should clean if never open here. Need to take off the 2 arms of window cleaning to get the way through the 4 nuts of the metal grid.No, I have never opened any of that ductwork.
Boring job but must be done minimum every 5 years i think…The dark shit was near the metallic filter. You should clean if never open here. Need to take off the 2 arms of window cleaning to get the way through the 4 nuts of the metal grid.