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

How would you go about adding a filter slot to this? : rhvacadvice return air support box with filter slot slot, these are not provided with this product For an option with removable channels for multiple filter sizes, see our FRB filter rack base; Come in a return to paris slot Browse articles about LG product repair information, installation guides, troubleshooting, how-to-use and other useful tips for your LG appliances and

return to paris slot slot, these are not provided with this product For an option with removable channels for multiple filter sizes, see our FRB filter rack base; Come in a

return linear slot diffuser I've also sorted a housing for the stale air return that holds a 16x25x1 filter so I can pull the restrictive exchanger filters on both supply This return air support box is for use with systems where the return air must come in underneath the furnace or air handler The support box can hold a