Product review (4 stars): Overpriced, Works for our Purpose.
We have a heat register centered under a set of drawers in our kitchen. It's a gaping hole in the floor that we can't access without cutting a hole in bottom of the drawer cabinet. The register cover is about a foot in front of the register in the kickboard. Everything in the drawers was getting nice and warm without much heat getting directed out into the kitchen. This "vent extender" fits almost perfectly from the wall to toeboard, effectively directing the air out into the kitchen. Fortunately, it's made of cheap plastic that I can cut to put the register cover back on. It is not sitting on even ground under the drawers (hard wood gives way to subfloor), but it still manages to keep the drawers from warming up without leaking much warm air around the edges. It may help that the two pieces of the extender stay overlapped in the space, giving an extra wall of insulation. I was truly surprised by how well this item worked for my purpose. My only criticism is that it's made of cheap, flimsy plastic and is overpriced for the type of material.