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return air support box with filter slot   Dan return linear slot diffuser

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 Warranty Policy: NZXT Warranty Have Motherboard Support: Mini-ITX, Micro-ATX, ATX Enclosure Type: Mid-Tower Case

are slot machines really random Each air filter box accepts standard MERV filter replacements that slide into the inner chamber's filter slot support@ Dealer & Bulk 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