American Gas Lamp Works Gothic 2900W 21" Charcoal Gray Residential Wall Mount Aluminum Natural Gas Lamp With Dual Inverted Gas Mantle Light Assembly, Flat Tempered Glass Panes and Brass Plated Acorn Finial w87 making it an ideal choice OPT RGLPC48FSEN SLV LP making it an ideal choice for a modern living space or living room fireplace upgrade 25" Door opening – dimension (Height) 10 1 2" Door opening dimension (Width) 25 3 8" Firebox – dimension (Height) 12 3 8" Firebox – dimension (Width) 22 5 8" Firebox – dimension (Depth) 12 7 8" Moulded refractory bricks Yes Stainless steel secondary air system improving gas combustion Yes Adjustable threaded legs Yes Steel thickness – body 3 16'' Steel thickness – top 3 16'' Fireplace opening – minimum (Height) 27 1 8" Fireplace opening – minimum (Width) 31 3 4" Fireplace opening – minimum (Depth) 22 1 8" USA standard (emissions) EPA Canadian Standard (emissions) CSA B415 Mantle burners are intended to burn 24 7 and do not flicker like a flame American Gas Lamp Works LLC (“AGLW”) warrants that its gas and electric lighting fixtures (the “Product”) will be free from defects in material and workmanship from the date of manufacture by AGLW for the following periods: