Completed installation of (2) 8†round pipes ducting the heat from both wood fireplaces to a common 10†pipe, and then into the return air drop at the furnace. Ran both 8†pipes above a finished ceiling approximately 30’ to an upper and lower fireplace, then attached each to a fireplace. Tied both runs into (2) separate inline fans that the homeowner provided, then attached them into a single 10†pipe which we attached to the furnace drop. Thank you for choosing Black-Haak Heating and Electric. Please take a moment to fill out our online survey.