Model L900-NG1 L900-LP1Fuel Type Natural Gas PropaneMinimum Supply Pressure 5” W.C.(1.25 kPa) 12” W.C. (3.00 kPa)Manifold Pressure - High 3.5” W.C. (0.87 kPa) 10” W.C. (2.49 kPa)Manifold Pressure - Low 1.6” W.C. (0.40 kPa) 6.4” W.C. (1.59 kPa)Orifice Size #30 DMS #49 DMSMinimum InputAltitude 0-4500 ft. (0-1372m) 28,000 BTU/h (8.20 kW) 31,000 BTU/h (9.08 kW)Maximum InputAltitude 0-4500 ft. (0-1372m) 41,500 BTU/h (12.16 kW) 38,500 BTU/h (11.28 kW)Vent Sizing 5” Inner / 8” Outer 5” Inner / 8” OuterUnit Dimensions Description L900-1A Firebox Width w/ Standoff 51-1/2” (1308mm)B Rear Firebox Width 40-5/8” (1032mm)C Firebox Height 41-3/8” (1051mm)D Height w/ Standoff 50-3/8” (1270mm)E Unit Depth 27” (686mm)F Height to Vent 44-1/2” (1130mm)G Fireplace Opening Height 32-1/16” (814mm)H Fireplace Opening Width 33-5/8” (853mm)I Height to Fireplace Opening 3” (76mm)L900-1 Gas FireplaceApproved Venting SystemsFlex Vent Systems: FPI AstroCap™ Flex VentRigid Pipe Vent Systems: Simpson Direct Vent Pro®Selkirk Direct-Temp™Metal-Fab® Sure SealRegency Liberty L900 Gas FireplaceUnit Dimensions:Framing Dimensions:Non-Combustible Requirements:Framing Dimensions Description L900-1J Framing Width 52” (1321mm)K*** Framing Height*** 50-3/4” (1289mm)*** + HearthL Framing Depth 26-1/2” (673mm)M Minimum Height to Combustibles 60” (1524mm)N Corner Wall Length 63-15/16” (1624mm)O Corner Facing Wall Width 90-7/16” (2286mm)P Vent Centerline Height 53” (1346mm)Q Non-combustible facing height 17-7/16” (443mm)R Gas Connection Opening Height 2” (51mm)S Gas Connection Height 11-1/4” (286mm)T Gas Connection Inset 6” (152mm)U Gas Connection Opening Width 5” (127mm)***Important: Framing height requires consideration of the hearthdepth. Dimension K = K + the thickness of installed hearth.WARNINGFailure to maintain required clearances is a major cause of chimney related fires.Installation of this fireplace must comply with these clearancesPlease note: Due to ongoing product development, product appearance and specificationsare subject to change without notice.This manual is intended to be a Sales Reference Guide only.Do NOT use for actual framing and installation of any unit.Some specifications may change without notice.You must use the actual manual for exact installation specifi cations.