Regency's Greenfire Medium Pellet Insert includes an adjustable hopper, allowing this unit to fit into fireplace openings as low as 19.5". Steel fluted liner panels compliment the large bay ceramic window and gives you an exceptional view of the fire. The heavy-duty heat exchanger will burn pellets completely and any remaining ash will fall into the concealed ash pan (included). This unit gives you the most out of your fuel and the extra time to do the things you love. Features: Concealed ash pan Heavy-duty heat exchanger Steel fluted liner panels Decorative Black Grilles Up to 55 lbs hopper capacity with easy access lid and recessed handle Quick start automatic (300 watt) ignitor Concealed, easy-to-use controls with Tri-mode operating system 160 CFM Convection Variable Speed Blower Designed to burn wood pellet fuel Easy to clean, low maintenance burner Backed by the industry's most comprehensive Limited Lifetime Warranty What's Included: Regency Greenfire Pellet Insert - GFi55-2 Ceramic Glass Specifications: Fuel Type: Pellet Maximum BTUs: 45,000 Higher Heating Value Efficiency (HHV): 70% Lower Heating Value Efficiency (LHV): 74.5% Burn Time: Up to 36 hours Hopper Size: 55 lb. Viewing Area: 161 sq. in. Emissions: 0.89 gm / hr Unit Dimensions: Height: 19-1/2" Front Width: 26" Depth: 15" Documents: Regency Pellet Brochure: Link Owner's Manual: Link Technical Manual: Link Spec Sheet: Link