I have a situation where a house was roughed in 'per specs' for downdraft located in an island in the middle of kitchen. Its time to trim and they gave the wrong information for the rough, turns out the fan for down draft is now mounted remotely "downstairs in basement". Was wondering if its a code violation to run mc cable down the exhaust duct where they will be cutting in and adding the fan. 330 states not to be embedded in concrete or used in destructive corrosive enviroments. Can this legally be done or would I have to use the rubber coated mc cable?