BDM Dalsin Line 3" 24 Gauge Stainless Steel Masonry Chimney Decorator Collar w49.625 Flow Water Fitting (1 ½” o12.125 Flow Water Fitting (1 ½” Inlet) 25" 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 Model Legs or pedestal Steel thickness – body 3 16" Steel thickness – top 5 16" USA standard (emissions) EPA Canadian Standard (emissions) CSA B415 Diameter 3" Material Stainless Steel Continuous laser weld construction