We would like to complete a walk through with our installers prior to install to go over any areas of the ceiling we would need to have opened up for access to the round pipe. 1-21-20 Completed install of duct to replace the wall stack in the wall being removed. Removed 2 six inch pipes from main duct in basement and then removed the wall stack from wall between dining area and living room. Installed duct in Place of the 2 6†runs and routed it up through first floor to the underside of the second floor and reconnected the 2 round pipes that supply upper portion of the home. Thank you for choosing Black-Haak Heating and Electric. Please take a moment to fill out our online survey.