The G4 is an advanced burner system that creates dancing flames, maximum glowing effects and provides radiant heat into the room. The G4 burners have the same exact characteristics as the G45 burners except that they have only a single tube burner, there is no additional front flame burner that T's off the main burner, so the glowing embers will not glow quite as much as with the G45 burners. The G4 is less expensive than the G45, and most people will choose the G45 over the G4 burner because they prefer having an additional front flame. Includes Listed Glowing Ember Burner, Custom Grate, Glowing Embers, Sand NG or Vermiculite LP , Flex Connector Kit, Burner Clips and Damper Clamp. Features Fuel Type Natural Gas. Compatible with 42 logs. Burner Type Standard. Minimum Firebox Dimensions 48 Front Width x 46 Rear Width x 20.5 D x 18 H . Note Logs sold separately, please see related products for compatible options.