Young Blonde Girl Posing By The Fireplace

• Manufactured ("prefab") fireplaces with sheet metal fire boxes.
Masonry and prefab fireplaces can be fueled with wood, natural gas, biomass and lp/propane fuel sources.
• Ventless Fireplaces (duct free/room-venting fireplaces) that are fueled by either gel, LP/bottled gas or natural gas. In the US, some states and local counties have laws and ordinances regarding these types of fireplaces. They require the least installation and are the most efficient fireplace. The gas burning version of a vent free fireplace while using less fuel, burns that fuel at close to 100% efficiency. They must be sized appropriately to the area to be heated. Aside from the heat output there are also air quality control problems due to the amount of moisture they release into the room air, and oxygen sensor and carbon monoxide sensors are safety essentials.