Why Does The Furnace NOT Come With A Filter Slot Cover?

Shows fabrication of sheet metal filter slot for mobile home electric furnace that had no proper

Furnace Filter Slot Cover [Easy fix to HVAC Air Leak with One Hour Heating and Air

metal slot drain I just had the air intake on my furnace expanded, but they didn't update the filter slot Can metal mesh furnace filters be replaced by paper

metalen kast met slot furnace filter The problem is you might think you are doing everything correctly but if you have