How to Make a FILTER RACK in a Plenum or Duct so that

I'm in the process of getting a new furnace and one contractor suggested moving the filter media slot higher up in the 10x24 return air

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return of kong slot Take advantage of the durable 30-gauge zinc-coated, galvanized steel construction of this Master Flow 20 in x 25 in Return Air Box to equip your HVAC