DuraVent DVL 6" 45° Double Wall Black Elbow Myriad Assembled indoor vented 3 burner traditional OPT SONAGFRC38ML BLK NG Assembled indoor vented 3 burner traditional gas log system featuring hand painted glass with cast iron frame Glass type Ceramic glass Glass surface – dimensions (Width X Height) 15 7 8" x 9 7 8" Glass air wash system Yes Overall dimension (Height) 30 1 8" Overall dimension (Width) 28" Overall dimension (Depth) 23 5 8" Door opening – dimension (Height) 8 3 4" Door opening dimension (Width) 17 1 4" Firebox – dimension (Height) 11 7 8" Firebox – dimension (Width) 19 5 8" Firebox – dimension (Depth) 13 1 2" Firebox lined with refractory bricks for better heat distribution Yes Stainless steel secondary air system improving gas combustion Yes Steel thickness – body 3 16" Steel thickness – top 3 8" USA standard (emissions) EPA Canadian Standard (emissions) CSA B415 DuraVent's DVL is a UL 103 HT listed double wall close clearance connector pipe system that runs from the appliance flue collar to a Class A chimney