Empire Direct Vent Wall Furnaces are specifically designed for areas where flues or chimneys are not available or cannot be used. Empire Direct Vent heaters have removable front panels for easy cleaning and servicing. With a Direct Vent system, there is a positive difference in fuel economy because outside air is used to support combustion. The air on the inside is warmed as it recirculates around a sealed chamber. This warm air heats the room cleanly and efficiently.