I just purchased an older home that has these unsightly BLACK baseboard diffusers. I would like to replace them with something new and nicer looking, the problem is, the largest I can find is 48 inches and I have ones in my house that are close to 100 inches long. Now the actual heat duct is only 12-18 inches long but whoever put them in must have thought the longer diffuser would distribute the heat better. I tried to get one of them out in my bathroom, but it seems as if it is actuall plastered into the wall not just butted up against the wall. Has anyone ever seen/dealt with anything like this? IF so, how did you deal with it. I'd like to replace them for soemthing livcer looking and also to have the ductwork cleaned out but I do not know where to begin. HELP!!!