I just had an Enviro Q3LI direct vent gas fireplace installed. The original opening is bigger than the fireplace so my installer is having a metal surround plate made to cover the gap. I would like to have the metal surround plate, as well as the original screen cover powder coated in an antique bronze finish (dark brown with a faint gold sparkle). I don't like the matte black finish in my family room. My metal coating guy asked me for the "temperature rating" for the metal screen. I've looked at the manual and can't find this info. Basically I need to know what is the highest temperature the metal screen will get so that we purchase the right coating. Thanks in advance for any thoughts! Meredith