How would you go about adding a filter slot to this? : rhvacadvice

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

Southwark SBF30 return air support box for 24 x 8 duct with filter slot for 20 x 25 filter, accommodates 1, 4 or 5 thick filters, 26 gauge galvanized tin

return of kong megaways slot review Snappy™ SBF30 Return Air Support Box with Filter Drawer, 30x28x15 in D, Steel, Galvanized

return to paris slot 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