I have inherited a GTI model 5000 GDV-HIS gas fireplace. The previous owner of the house says “it never worked right”. The problem, then and now, is outside air gushing into the room from the fireplace. I have removed the decretive cover and I think I see the source of the problem. There is a 4 inch opening in the lower right back corner of the fireplace that the outside air spills through. I’ve not removed the outside vent cover to confirm the vent type but I believe it is a double or triple wall horizontally vented pipe. Does it sound like this fireplace was plumbed correctly? I thought that cold air was suppose to be delivered directly to the combustion box.
Can anyone direct me a manual for this fireplace? I’d like to see the installation diagrams before I call in a tech. I can not find a website for GTI.