![]() A standard co-axial vent pipe uses a four-inch inner pipe that removes all the by-products from combustion out of the fireplace. Your coax cable wire is a wire wrapped around another wire. It sounds like an impressive term, but all co-axial venting means is a pipe within another pipe. Only air from the outside is used for combustion in the firebox. Inside room air is not used for combustion purposes. This means that the air for the combustion process comes from outside, via a special vent pipe. Regardless of the type of glass, it will be sealed to the edge of the firebox with a rope gasket.ĭirect vented gas fireplaces use a sealed combustion process. Depending on the BTU output and specs of the fireplace, it will have ceramic or tempered glass. Ceramic glass can withstand very high temperatures, higher than tempered glass. It’s similar to the glass on your electric range in the kitchen. The glass on many gas fireplaces is a ceramic material. GLASS, SEALED COMBUSTION & CO-AXIAL VENTING. A heat sensitive switch turns them on/off. Fans usually have several speeds or operate on a rheostat, a variable speed control. A small fan, located beneath the burner at the bottom of the fireplace, moves this warm air into the room. As air is circulated in this chamber, heat is transferred. After the burner ignites, the inner steel starts to heat. Picture two metal walls with the air moving between them. Linear styles for a contemporary look that might be 12” - 15” high, but five, six, or even eight feet long! Portrait styles are popular in tighter, smaller spaces.Ī space, or convective air chamber is designed into the fireplace to allow warmed air to move into the room. ![]() There are traditional looking fireplaces that are three, four or five feet wide. Today, the size and dimensions of the firebox will vary tremendously. The firebox, built out of steel, is cut and fabricated by sophisticated equipment to exact specifications. But different log species, driftwood logs, colored glass beads, pine cones and bamboo will add an individualized custom touch to many fireplaces. Lots use realistic looking ceramic logs that glow when they’re heated. Today, many gas fireplaces have “media” options. This will quickly dissipate as the unit heats up. Since, the inside of the glass is often rather cool, the heat from the burner igniting will cause some condensation. On initial start-up, it is not unusual for condensation to develop on the inside of the glass. There are small holes designed in the burner to allow gas to flow through, allowing the embers to glow and the flames to dance. This pilot light can be an on-demand, intermittent light or a steady-on pilot light. When the thermostat calls for heat, or the wall switch is flipped on, or the remote control is pressed on, the valve opens allowing gas to flow into the burner. The burner includes the gas valve, fittings, and the control board. Depending on the model, the burner will be a ceramic material or a tube style burner. Normally, either a half inch or 3/8” gas supply line is connected to a burner. That is, unless you look out the window and see an LP tank in the side yard! Based on flame appearance, once a gas fireplace is warmed up, it’s nearly impossible to tell any difference between NG and LPG. Other than that, the basics are very similar. This means the burner regulator and orifice are different for the two gases. The two gases operate on slightly different pressure NG 6” water column pressure, LPG twice that. Gas fireplaces operate on either natural gas (NG) or LP gas. But how do they work? Are they complicated to operate? Do they use a lot of gas? THE BURNER BASICS And, they’re not just for the family room anymore. Gas fireplaces are more popular than ever. If you don’t have one in your home, you have friends and family members who do.
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