Hello! This is a 42" Fire Place! Hope that helps - Anymore questions, feel free to ask!

Can you please tell me the width of the wall the fireplace is on? Is there a standard that's used to determine what size fireplace should /could be used on a 6 foot wall?

Hello! The studs within the walls are most likely wood studs. You can go as close as 12" from each end, (inside measurement, not outer measurement), to allow for heat ventilation within the cavity, making room for a 32" linear unit. If you would like something longer/wider, you would have to have the studs changed to metal, that way, a longer unit could go up close to the studs.