My house is built on a concrete slab. My furnace is in a terrible place and I would like to move the furnace in order to expand my laughably small kitchen. I have a downflow furnace and the ductwork is all built into the slab. i want to basically cut a channel in the slab to extend the hvac ductwork so that i can move my furnace into the corner of the house. Is this possible? can i do it myself? any general recommendations on what I might be able to do? Thanks!