Video of replacement of a prefabricated fireplace system Posted on April 21, 2016April 11, 2016 RickPosted in Prefabricated fireplace system maintenance and repair Here is some footage of replacing a pre-fab system. It's a quick 2-minute video. Related posts: More on Prefabricated fireplace systems. Fireplace damper replacement. Pre-fabricated fireplaces – repair or replace? Pre-fabricated fireplace repair/replacement. Pre-fabricated fireplace systems – when to replace.