The MATRIX 2700 WOOD INSERT comes with a 5.5" x 25' FOREVER FLEX LINER KIT, including a stainless steel connector, top plate, and chimney cap with screen. With a height of 24 3/4" and a width of 33", it is designed to fit a chimney diameter of 6". The non-catalytic combustion technology allows for a long burn time of up to 8 hours, heating an area of 750-2,200 ft² efficiently.