Hi people. I am a territory manager for an outdoor kitchen manufacturer. Primarily I deal with various home builders and we handle all of their outdoor kitchen projects on new home builds. Recently my company has made the decision to move into indoor fireplaces within the same market. I know nothing about indoor fireplace...direct vent, b-vent, vent free....my head hurts! Not to mention building codes. Can anyone suggest an information source on indoor fireplaces? A "fireplace 101" if you will. Thanks in advance.