Gas Fireplace Inserts Vent Styles

Direct Vent

• Direct vents are one of the simplest types of gas fireplace insert venting. The vent simply goes out the back of the fireplace, through the wall, and into the outdoor air. This usually means that the vent is only a foot or two in length, which can save on remodeling costs. One pipe is used, with an inner pipe for exhaust and an outer pipe for air intake. These are efficient vents useful for well-insulated homes.

B Vent

• A B vent is similar to a direct vent, but with one important difference. It uses a vertical pipe, like a chimney, and typically exits through the roof to draw in combustion air. B vents can work with your insert if you do not want to use your old chimney but still want a decorative, vertical venting system. If you are planning on keeping your hearth but altering the position of your fireplace, a B vent can make installation more flexible.

Chimney Options

• For many inserts, a chimney is already in place. While it may be tempting to use this chimney, your gas fireplace still needs a proper vent. In this case, it is usually best to run a hidden B vent up through your fireplace. This is one of the most cost-effective options, since the B vent is already affordable and remodeling is minimal when it uses the chimney vent.

Vent Free

• Some gas fireplace inserts are vent free or ventless. These are unique types of fireplaces that use radiant heat and heated air to warm a room while burning gas so thoroughly that very little exhaust is produced. The exhaust that is created is safe enough to vent into the room. This option works well with awkward fireplace shapes and remodels where a vent system is not practical.