The stylish Flavel Raglan traditional balanced flue gas fire is designed to fit into houses with out a chimney or flue and its glass front does more than simply look great...it increases efficiency too. Safety: Flame Supervision Device (FSD) Type of Heat: Radiant & Convected Heat Input High: 3.8 kW Heat Input Low: 2.5 kW Heat Output High: 2.8 kW Heat Output Low: 1.7 kW Air Vent required: Not normally Builders Opening Sizes: Height: (min) 555 mm (max) 560 mm Width: (min) 410 mm (max) 430 mm