Gas Fireplace Installation in Connecticut

A direct-vent unit is sealed: it draws combustion air from outside through one pipe and exhausts through another, usually horizontally through a wall. It does not use room air, and it can go where there is no chimney at all. It is the type most new installations use.

A natural-vent unit — sometimes called B-vent — draws room air for combustion and exhausts vertically, up a chimney or a dedicated flue. That means an existing chimney can often be used, usually with a liner sized to the appliance.

Vent-free units exhaust into the room. They are permitted in some places and not others, they add moisture to the house, and they are a genuinely contested product. We will tell you our view if you ask, but the important point is that it is a different decision from the other two rather than a cheaper version of them.

Assessment first: the position, the venting route, the gas supply and, where an existing chimney is involved, its condition and size. That assessment is what makes the rest predictable, and skipping it is how a project discovers a relining requirement halfway through.

Then the preparation — the opening or enclosure, the hearth if one is required, and the gas line to the appliance position. Then the venting, which for a direct-vent unit is the coaxial pipe run to its termination, and for a natural-vent unit is usually a liner run down the existing chimney and connected at the appliance.

Then the appliance itself, connected, commissioned and tested, with the media and glass fitted and the controls set up. And then finishing and making good.