Linear ProBuilder Collection Home / Our Specialties / Fireplaces / Gas - Linear / Linear ProBuilder Collection ProBuilder 42 Linear Viewing Area 40-3/8”W x 13-5/8”H BTU 25,000 - 13,000 Heating Capacity Fuel Type Gas ProBuilder 54 Linear Viewing Area 52-3/4”W x 13-3/4”H BTU 33,000 - 17,000 Heating Capacity Fuel Type Gas ProBuilder 72 Linear Viewing Area 70-3/4”W x 13-3/4”H BTU 45,000 - 17,000 Heating Capacity Fuel Type Gas Heat Management CoolSmart TV Wall Kit Logs Twigs & Stones Tumbled Stones Traditional Driftwood Logs Birch Liners Black Glass Ledgestone