I might be wrong here but the old fridge had a vent at the bottom. This was to draw cool air from the floor up thru the back and out the vent on the side and top. By putting the drawer in their, this kind of eliminates the air flow. Nice job on the drawer but it will probably cause the fridge to run a tad more than without it. You could vent the drawer some how I guess.Since I installed my vitro I wouldn't even think of going back. These things work great.