(aka Zero Clearance Fireplaces)
While this page provides very good information about the prefab chimney systems, we strongly recommend going to some of our more detailed pages about prefabs, such as the Prefab Chimney Characteristics page and the Prefab Refractory Panel Replacement page that shows a complete set of refractories being replaced in a prefab fireplace.
Shown below are the two types of prefab fireplace installations: one with a surrounding housing called a "chase", and the other with the metal flue pipe extending up above the roofline...
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Like other parts of your home, chimneys and fireplaces require some maintenance, inspections and occasional repairs. Using a professional chimney sweep will assure that your chimney has been fixed or cleaned properly and safely. See the diagram below and read the descriptions of the chimney, how the parts work together and some of the maintenance and repairs chimneys require.
In matters of fire safety the best way to assure your safety is to have a professional chimney sweep inspect your chimney. The diagram and explanations here are to help you know when to call the chimney sweep and to understand the work the chimney sweep is performing.
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Notes
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Prefab fireplaces are not designed to handle extremely high temperatures. It is recommended to only burn 2 or 3 small pieces of wood at a time, or 1 manufactured log at a time, such as Duraflame or Pine Mountain.
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If the refractory panels do crack, and the thickness of the crack is the thickness of a dime or more it should be replaced. Many manufacturers will only sell the panels as a complete set (backwall, 2 sidewalls, floor panel, and possibly ash lip).
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Aftermarket nonfactory glass doors are not recommended on a prefab fireplace. They may cause the system to overheat, and the system was not tested and approved with them any warranty may be void.
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A prefabricated fireplace are ones that have been manufactured in a factory and installed at a home or job site. Many of these are ventless. This allows the user to burn a gas fire without the need to vent any fumes to the outside of the home. These fireplaces are typically installed inside of an existing fireplace, while the majority of units are built now for new construction or remodeled rooms.
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Most prefabricated fireplaces work with manufactured gas burning logs. These logs resemble natural logs, but they are ceramic and equipped with a gas line running through them. These gas lines also feature tiny gas holes that simulate flames running along the length of the log set. Vented fireplaces uses different logs than ventless versions.
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Installing a prefabricated fireplace requires the construction of a surround. The opening of a surround is designed to allow the metal fireplace to slide into place and attach through the flange on the fireplace. Screws that are run through the metal flange of the fireplace and into the wood of the surround efficiently mount the unit in place. Gas and electric lines run to the fireplace inside of the surround.
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A lot of these fireplaces are designed with blowers. By installing small electric blowers inside the fireplace, the heat generated from burning the gas logs can be blown into a room. This creates not only the peaceful visual pleasure of a fireplace, but the warming qualities as well.
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On the vented prefab fireplace models, the gas fumes are directed out of the home with a chimney. The chimney is often a façade of wood construction surrounding galvanized stove pipe. The galvanized pipe is typically multi-layered and is run through the false chimney along the exterior wall of the home and vented near the peak of the roof line. In homes with an actual working chimney, the fireplace is routed to the chimney with the multi-layer pipe.
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Prefab fireplace designs offer the best of both worlds to homeowners - the safety and convenience of a gas fireplace that is complete with safety features along with the romance and atmosphere of a wood burning fireplace. Cleaning of ashes and soot are replaced with dusting and polishing the metal construction. A multitude of mantle designs are available to maximize the visual impact of the fireplace inside of a home.
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Alteration Options
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The expense and labor involved in a prefab fireplace replacement may lead you to consider a conversion or alteration of your fireplace. CAUTION: ABSOLUTELY DO NOT PUT GAS LOGS into a damaged or deteriorated wood burning fireplace. Vented gas logs require the fireplace and chimney to be suitable for use with wood; if it's not safe to burn wood, it's NOT SAFE to use with gas logs, either!
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A GAS INSERT is a stove that inserts into your fireplace and may be a practical option to tearing out the fireplace that's already there. As some gas inserts carry a dual listing as either an insert or a complete fireplace system (such as the Windsor), inserting it into a metal fireplace should not cause fire safety concerns. Again, you'll have the convenience of burning gas and it's comparatively inexpensive versus replacement of the fireplace.
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An ELECTRIC INSERT is a very inexpensive option. An electric fireplace is uniquely capable of offering you flames with no heat so you can have a romantic fire in the summer, or use with the heater when the weather turns cooler. This at least provides you the ambiance of a "fire" with no need to tear anything out, and is an option many of our customers have chosen in recent years.
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Installation:
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Only have a qualified professional hearth installer who is NFI certified do the installation. We HIGHLY recommend NOT making this a DIY project! Most city codes require installation to be completed by a licensed installer. One small mistake can result in a house fire, so it is not worth trying to do this yourself or having a builder who is NOT NFI certified do the installation. Do a search on the NFI website to find a local certified installer.
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Never have any part of the system replaced with anything other than those that have been made and approved by the manufacturer to be installed on your specific system. This applies to chimney caps, refractories, glass doors, and chimney flue pipe. For more information on Prefab fireplaces, check out these other pages.
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Primary Safety Concerns
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Improper Installation It is by far the most common cause of failure. If clearances to combustibles weren't closely followed, along with exact configurations of the metal chimney venting, the ignition temperature of the wood and sheet rock nearby the fireplace can be reduced over time, a process called "pyrolysis".
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Improper Use Keep in mind, a prefabricated wood fireplace is designed for occasional, recreational type fires. Don't over fire by building large, hot fires or use them for hours and hours on end to try and heat. By and large, these fireplaces are considered decorative appliances and are not designed to provide substantial heat.
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Field Modifications It is extremely inadvisable to install a stove (such as a wood burning insert) into a prefab fireplace. Use caution when attempting to install after-market glass doors, too, that may interfere with the fireplace's design to circulate and disperse heat properly. Never attempt a renovation project that covers louvers or air channels that were designed to help keep the fireplace properly cooled.
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Inadequate Maintenance It's imperative that you have your chimney checked annually and the chimney swept when needed. One of the most important aspects of the inspection is the chimney termination on your roof. The flashing surrounding the chimney pipe easily becomes deteriorated over the years, contributing to water damage, rain leaks and rotting wood. Deteriorated flashing can also allow birds and animals to enter the chimney chase (the framed "wooden" chimney area) where varmints often build flammable nests adjacent to the pipe.
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If you're advised of a safety or performance issue, DO NOT use your fireplace. It's time to investigate replacement or alteration
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Prefab Chimney Characteristics
Prefab Refractory Panel Replacement
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