Is it a problem that my furnace filter is loose in its slot?

Why Does The Furnace NOT Come With A Filter Slot Cover? furnace filter slot It could be that the cabinet is set up to accept a one inch or two inch filter You would have to remove the side tracks to insert a two inch furnace filter slot cover This patented two-piece system is designed for 1-inch air filters Placing it over the furnace filter slot eliminates air leakage, which improves indoor air

pg888 slot I just had the air intake on my furnace expanded, but they didn't update the filter slot Is it acceptable for a forced air furnace filter to