OK, I think I looked through the whole site and couldn't find this information, so here goes. In Q&A 748 you mention that using "generic" fireplace doors can be very dangerous with a prefab, but you don't say why. I have a Majestic MHC36 prefab which was in the house when we bought it. The doors that are on it sure look like the ones they sell in Home Depot. The insert is set back 4" inside a brick facade. The doors are installed on the brick facade. I have contacted Majestic to get a copy of my owner's manual and installation instructions, but the insert is ~20 years old now, and it took them a couple of weeks to find any information on it. It called out a fireplace door that is no longer in production. What should I be looking for to find out if my fireplace doors are dangerous?