The new Lyric vent free contemporary burner with fireglass media creates a stunning modern style aesthetic while still delivering all the heat and efficiency expected from a Monessen vent free gas product. Includes: Contemporary burner with multi-peak flame and shimmering, elegant ember bed Includes Onyx fire glass media Auto-spark igniter Natural or propane gas Millivolt control Dual rated for vent-free and vented applications (vented installations require purchase of a damper CSA design certified Minimum Fireplace Dimensions: 18" - 27W x 14D x 16H 24" - 31W x 14D x 17H 30" - 37W x 14D x 17H