I have just installed a Clear Vue and am just getting off the floor after receiving my quote from NordFab. I knew they were pricey but was not ready for their number. K & B Ducts are less than half and then there is PVC about 1k under K&B. I have not found a local supplier of S&D so I have priced SDR35. I have not heard much about K&B on the forum and would like some comments from anyone who has dealt with them.