“Captivating” is the only way to describe these massive fireboxes. Designed for large interior applications, the VRT4500 Custom Series Vent-Free Gas Fireboxes feature a 30” tall opening and beautiful refractory panels for a realistic appearance. Features Available in 36”, 42” and 50” models 99.9% heating efficiency when paired with a vent-free gas log set Fully insulated firebox for increased performance in colder climates Refractory panels available in a variety of patterns and colors Includes mesh fire screens Dual (left hand/right hand) outside air kits available for maximum performance Durable textured powder coat finish Compatible with any listed ANSI Z21.11.2 vent-free log set. Choose a beautiful and reliable Superior vent-free log set for best results. 20 year limited warranty Framing Width 45-3/8" 51-3/8" 59-3/8" Framing Height 54-5/8" 54-5/8" 54-5/8" Framing Depth 28-1/4" 30-1/8" 30-1/8"