Direct-vent systems are usually more expensive and less energy-efficient since heat escapes up the chimney. Unvented or vent-free systems are usually less expensive, but they aren’t designed to ...

The Direct-Temp® direct-vent chimney system contains a proprietary woven fiberglass seal, which makes a secure connection, ensuring that combustible products will not leak out of the chimney system, ...

Q: My question concerns the chimney and flue arrangement in my ... to blow the exhaust gasses out a plastic pipe; and the "direct vent" types that draw combustion air from outside the house ...

The Metalbestos Model MDV Direct-Vent Chimney System with an inner stainless steel liner, provides corrosion pro-tection with minimal leakage, says the manufacturer. It contains a woven fiberglass ...

Q. I plan to install a gas fireplace myself for additional heat in a large family room. I want an efficient one, but one which also has realistic flames. Is a direct-vent design my best option?

The downside of a vented system is that you lose much of the radiant heat from the gas fire right up the chimney ... will help you heat a room, a direct vent gas burning system can be a better ...