Inserts are complete units that fit into existing fireplaces. They require no additions such as glass doors or screens, and consist of a combustion chamber with gas logs. They are usually installed in an existing chimney, provided an approved flue liner is installed. Inserts are typically available for a vented or direct-vent application. Uses a dual vent system, generally two 3 flex gas lines, one pipe is for exhaust, while the other pipe brings in outside air for combustion. The design of these inserts allows for a completely sealed system that does not compromise inside air quality of your home.Bedroom Approved: Yes Blower: Includes Variable Speed Heat Activated Blower Brick Liner: Optional Depth (Front to Back): 14-3 8 Efficiency: 75% Facing: Circulating Front Width (Right to Left): 26-1 4 Glass Type: Ceramic Height (Ground to Ceiling): 21-3 8 Max BTU Output: 22500, 25688 Maximum BTU Input: 30000, 34250 Minimum BTU Input: 28500, 31000 Minimum BTU Output: 21375, 23250 Minimum Size of Fireplace for Installation: 26-1 4 W x 21-3 8 H x 14-3 8D Mobile Home Approved: Yes Piping Type: Direct-Vent Valve Style: Electronic Ignition{Standard Features: Dual Burner with glowing embers Matchless Piezo Ignition Decorative Ash Bed Ceramic Glass On Off Rocker switch Heat activated blower with variable speed control Bedroom and bed sitting room approval Mobile home, bedroom and bed sitting room approval {Optional Features: ~Log Set~ – Fibre Split Oak ~Glass Tray with Bronze Glass~ ~Designer Clean View Kit~ – Black, Pewter, Copper Vein ~Surrounds for Clean View~ – Black, Copper Vein and Pewter ~Surround Picture Frame for Clean View~ – Black ~Louver Kit~ – Grills available in Black, Classic Series Black with Antique, Chrome, or Polish Brass accents ~Surrounds for Louver Kit~ – Black ~Porcelain Reflective Liners~ ~Brick Liner~ – Classic – (IDV33), Traditional or Herringbone – (IDV36) ~Wall Mount Thermostat~ – Standard On Off or Programmable ~Remote Control~ – On Off, Thermostat, or Modulating Hi Lo with Thermostat ~Overlay A