True or False: The fireplace firebox walls are slanted to reflect heat energy into the room.

The statement is true because many fireplace firebox designs feature slanted walls. This design is intentional as it enhances the efficiency of the fireplace by directing and reflecting heat energy into the room. The angle of the walls helps to improve the flow of gases and heat, allowing more warmth to be emitted into the living space rather than being absorbed or lost. This design principle not only increases the effectiveness of the fireplace in heating a room but also contributes to the overall safety by facilitating better venting of smoke and gases.

While there might be variations in fireplace designs based on aesthetics or specific functional requirements, the use of slanted walls to maximize heat reflection is a common feature in many firebox designs.