A direct vent fireplace's design requires special venting because the chimney operates both as the path for the combustion air from the outside and as the exhaust for the combustion products. The FMI direct vent pipe is for use only with FMI direct vent fireplaces, and features a 5: inside diameter. The shorter lengths are ideal for venting directly through a wall behind the installed fireplace, while longer lengths can be combined to create a roof vent.
Will 8 inch FMI pipe hook up to standard stove pipe?
By Tyler M. - NFI Certified Specialist on December 23, 2013
No, FMI chimney pipe has proprietary connections and cannot work interchangeably with other manufacturers' pipe.
By Paul from Dubois, PA on December 17, 2012
Can I use B-Vent on my FMI fireplace model WC36NB1? I think I cannot but my plumber wants to! Do you think that will be okay?
By Collin C. - NFI Master Hearth Professional on December 18, 2012
This unit is not meant to be used with B-vent pipe. Because it is a direct vent unit, it must pull its air from an outside source. The FMI direct vent piping is designed to perform that task. While B-vent pipe could theoretically be used to vent the exhaust from the unit, I am concerned about how the plumber would attach it to the unit properly and how the unit would breathe, as it would be pulling air from an enclosed wall cavity.
Also, the unit will not meet code if B-vent is used and could be considered a fire hazard.