Like an artist who can bring the beauty of nature to life, Real-Fyre artisans work from real wood samples to meticulously recreate the intricate bark detail and natural coloration of wood. Superior refractory ceramics ensure the logs retain their strength at high temperatures Burns efficiently while protecting natural resources and reducing pollution High definition bark and natural colors for an authentic wood look Steel rods inserted in each log provides maximum reinforcement Radiant heat while in operation and after set has been turned off The new Real Fyre G31 three (3) - tiered burner system creates high and full bodied flame… while using fewer BTU’s than other vented burner systems. This burner has 2 specially designed log sets… PLUS it is also compatible with other gas log sets from the Real Fyre Vented collection. Minimum Fireplace Dimensions 18" - 25" FW x 20" RW x 15"D x 16"H 24" - 35" FW x 25" RW x 15"D x 16"H 30" - 39" FW x 28" RW x 15"D x 16"H 33" - 44" FW x 32" RW x 15"D x 16"H 39" - 47" FW x 32" RW x 15"D x 16"H Add 2" to front and rear width for Electronic Ignition BTU's (NG vs LP) 18" - 55k - 40K 24/30" - 65K - 50K 33/39" - 75K - 60K