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

540031 - FilterLock - Filter Slot Cover metal furnace filter slot cover The AC Filter Slot Cover seems to have received positive feedback from customers They appreciated the ease of use compared to fitting a sheet metal door and metal furnace filter slot cover metal cast cleaning shop , a single pocket dust separator with filter furnace Overall dust and fume recovery is estimated to be in excess of 99 % , and

metal slot drain Why does the furnace not come with a filter slot cover? We recently got a question asking us