I have a Carrier EAC with a bad power supply. Parts are insanely high for this thing, so I removed the guts and fabricated some little L brackets to hold a 16x25 pleated filter on the furnice/airhandler side of the case. This is protecting a 20 year old furnace that I am replacing in the next year or so. I change the sucker monthly to be safe. This should be sufficient no?