Direct Vent Fireplaces are factory built and their venting can be routed directly through a wall to the outside, using rigid or flexible venting. Direct vent systems are either co-axial (as stated above) or co-linear; Co-linear Direct Vent Fireplaces are used to vent through an existing wood burning chimney.
Most fireplace inserts are designed to increase a fireplace's efficiency. An insert is basically a fireproof box that's surrounded by steel or cast iron and fronted by insulated glass, creating a closed combustion system. The steel or cast iron helps to trap the heat. Some inserts have a blower that pushes the hot air back into the room through front vents.
As open hearth fireplace is easily described as the most traditional fireplace type. It has a firebox set in the centre of a very simple opening for the fire leading up to the flue. Unlike other fire types there is no lining made from cast iron for example.
Ventless fireplaces fueled by gas or propane rely on indoor air for combustion, and they exhaust a low level of their combustion gases into the room in which they’re located. A chimney or flue isn’t necessary. The risk to your health is a long-standing and ongoing debate.
Wall Mount Fireplaces If you don't have the floor space for a traditional fireplace with a mantel or TV stand, what you need is a Wall Mount Fireplace. These fireplace fixtures attach to the wall of your home and come in nearly all fuel types.
A wood-burning stove (or wood burner or log burner) is a heating appliance capable of burning wood fuel and wood-derived biomass fuel, such as wood pellets. Generally the appliance consists of a solid metal (usually cast iron or steel) closed fire chamber, a fire brick base and an adjustable air control.