Adding a vent under the kitchen cabinets...

[Higgy]

Hey there. As I was going around looking at what they did to clean my vents in my house, I noticed under the kitchen cabinets that the vent ended at the floor, and it was just the wood under the cabinets that were directing the heat to the vent cover, which is probably wasting a lot of heat. So I'm looking for recommendations on how to fix something up so that I can direct the air flow directly to the vent cover. I was thinking just some metallic venting, but I'm not sure how I'd attach it to the existing vent in order to direct it. Any ideas?