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How to Make a FILTER RACK in a Plenum or Duct so that return air box with filter slot This reversible left or right hand return air support box is for use with systems where the return air must come in underneath the furnace or air handler return linear slot diffuser This is a return air box with filter grille and filter with a 20 round adapter for 20 flex duct which can be installed in a ceiling or side wall

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