The 6000 Modern creates a unique burn – with a center flame rising from glass media (which you can get in different colors!) Choose between crystal glass (standard), black glass, cobalt glass or amber glass to have the heart of the fireplace reflect your decor. The highly reflective black ceramic glass refractory really makes the flames dance. Then there are the front options for this zero clearance gas fireplace. Choose the Modern front – shown here in Fog Gray front, or you can also get it in black . If you want an inside fit, select the Folio front in your choice of black, new bronze, or graphite. The 6000 Modern also features the IntelliFirePlus ignition system that saves fuel and money when the fireplace is not in use and with 28,000 BTUs is a good-sized heater. If you like the idea of the 6000 Modern zero clearance fireplace, but want something bigger, consider the 8000 Modern. It shares all the features of the 6000 Modern, but with 32,000 BTUs. 6000 Modern zero clearance gas fireplace dimensions: Front width: 41″ Height: 39 7/8″ Depth: 21 1/2″ 8000 Modern zero clearance gas fireplace dimensions: Front width: 48″ Height: 41 7/8″ Depth: 21 1/2″.