Comfort Flame"s Steep Pitch Flashing is designed for use with Comfort Flame and FMI direct vent fireplaces. Use FMI 5" x 8" direct vent pipe only. All Direct Vent and Wood Burning products require venting to the outside of the home to achieve proper ventilation and firebox combustion. FMI Products offers a full assortment of venting components to properly vent the Direct Vent or Wood Burning fireplace.