The Calibre balanced flue gas fire boasts efficiency of up to 93% and features a full depth coal fuel bed. This glass fronted fire has an exceptionally large viewing area and is available as a manual control or remote control model. The Calibre features a high quality chamfered trim and Grace fret in a choice of brass or silver finish. Safety: Flame Supervision Device (FSD) Type of Heat: Radiant & Convected Heat Input High: 4.6 kW Heat Input Low: 3.0 kW Heat Output High: 4.3 kW Air Vent required: Not normally Builders Opening Sizes: Height: (min) 550 mm (max) 570 mm Width: (min) 405 mm (max) 450 mm