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this happened once before and the 4 screws that hold the fan to the casing had come lose and so the fan was pretty much just jumping around causing the banging noise.
i opened up my box to see that this had happened again and so i tightened it same as last time but i'm still getting a knocking noise
any ideas?
do i need to replace anything?
im thinking of just cutting the metal grill that protects the fan off so it will stop the knocking noise