R. H. Peterson G9-20/24/30-12P - Propane Gas Burner with Remote ANSI approved with ODS safety system, pre-assembled valve, lava-fyre granules, glowing embers, custom grate, and connector kit. For use in fully vented wood burning fireplaces burned with the damper closed, or for approved ventless gas fireboxes that accept aftermarket vent-free gas logs. For prefabricated fireplaces (either vented or ventless), you must refer to your owners manual to see if ventless gas logs are allowed or if there are any restrictions or limitations. Not for use in California or any other city or state that does not allow the use of ventless products indoors (consult with your local building department before purchasing). Can only be used with Peterson log sets that are designed specifically to fit this burner. Cannot be used with any other brand of logs. Minimum Firebox Dimensions Front Width 22" x Rear Width 20" x Depth 13" x Height 18" - 24"