Linear Series Home / Our Specialties / Fireplaces / Gas - Linear / Linear Series U50 Linear Viewing Area 50”W x 20”H BTU 38,000 Heating Capacity Fuel Type Gas U50 Tall Linear Viewing Area 50”W x 26”H BTU 38,000 Heating Capacity Fuel Type Gas U70 Linear Viewing Area 70”W x 20”H BTU 52,500 Heating Capacity Fuel Type Gas U70 Tall Linear Viewing Area 70”W x 24”H BTU 52,500 Heating Capacity Fuel Type Gas Liners Painted Steel Fluted Infinity Glass