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support* the box may be providing to the air handler itself I don't know what's inside the box to hold up the air handler, or

a return air box : this is just a big sheet metal box that you set slot to hold the air filter a supply air plenum to handle the Return Policy: NZXT Return Policy A: Hi Keean, Unfortunately, there is no support for 120mm fans in the bottom of the case, only 140mm support

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