AIOs LCS are closed loop and don't need any special maintenance. In any case If you go for air cooling then whatever the number of fans you place in the case follow the rule of +1 fan intake over the exhaust fans. I do the opposite +1 fan exhaust, at the expense of dealing with a little dust. For the case use always 140 mm fans at medium/low rpm vs 120mm at medium/high rpm. Better performance and more silent.
AIOs LCS are closed loop and don't need any special maintenance. In any case If you go for air cooling then whatever the number of fans you place in the case follow the rule of +1 fan intake over the exhaust fans. I do the opposite +1 fan exhaust, at the expense of dealing with a little dust. For the case use always 140 mm fans at medium/low rpm vs 120mm at medium/high rpm. Better performance and more silent.