Category Archives: Ventless Gas Appliances

Safety of Ventless Gas Appliances

As the name would imply, ventless gas appliances, such as fireplaces or gas logs, operate vanguard-ventfree-fireplace-mainwithout the necessity of any sort of vent. Requiring no chimney or flue, ventless appliances can be placed in essentially any room of your home, which makes them extremely convenient to install. And because no heat from a ventless appliance escapes to the outside, all the usable energy stays in the space, cutting down on heating bills during cold winter months.

Since these appliances require no ventilation, some customers have expressed concerns regarding safety and indoor air quality. Fortunately, we can confidently say that ventless gas appliances are not only highly efficient but also extremely safe to use.

How It Works

The vent-free system works relatively simply. The “fire” consists of natural gas, propane, alcohol-based gels, and electricity. It burns at optimum efficiency in order to reduce the production of moisture and carbon dioxide for a well-ventilated room.

Safety Features

In order to ensure reliable operation, federal agencies heavily regulate the use of vent-free appliances. Within vent-free appliances is an exclusive system that detects oxygen levels and adjusts the appliances accordingly—low oxygen levels cause the flame to extinguish. This system, referred to as the Oxygen Detection Pilot System, is tamper-resistant. Any attempt to modify or tamper with the system will immediately disarm any gas supply, as well as the ignition service. Other safety features every vent-free appliance comes equipped with include:

• An automatic shut-off valve (triggered if the flame is disturbed, altered or extinguished in any way)
• A regulator that prevents over-firing if gas pressure were to increase
• An ignition that eliminates the use of matches or lighters
• Safety grills for fireplaces, gas logs and heaters
• Temperature regulator

Indoor Air Quality

In regard to carbon monoxide and oxygen levels, a federally funded independent research study on vent-free products concluded that CO emissions from vent-free gas products are well within nationally recognized indoor air quality guidelines, even for sensitive populations. In recent years, there have been several questions as to whether ventless appliances contribute to extensive moisture that causes mold growth. Again, a federally funded independent research study showed ventless appliances do not generate enough water to raise humidity to a level high enough to cultivate mold-growth. (In fact, water vapor from ventless appliances may even improve air quality for individuals who experience sinus issues in cold weather. Read our water vapor blog to learn more!)

Consumer Safety

At Fine’s gas, our number one priority is customer safety and satisfaction. There are a few steps to consider when investing in any sort of appliance that emits heat, vented or not. First and foremost, all homes—whether they have ventless heating appliances or not—should have a carbon monoxide detector. If you are considering investing in heating appliance, be sure it fits the area you are planning to put it in, and take note of its relation to drapes, walls, furniture, etc. Finally, always seek the help of a professional. Installing a heat source is not a do-it-yourself project.

Fine’s Gas provides reliable experts to walk you through any purchase and answer any question you may have. For more information on our products and services or to find out about the installation process, contact us today!

Water Vapor Released by Vent-Free Gas Logs

Empire ventless gas fireplaceYou may be surprised to learn that vent-free gas appliances produce water vapors, a process that occurs naturally when burning a combination of gas and air. This is especially valuable since during colder months, the relative humidity—or the percentage of water vapor in the air—is low.

According to the Mayo Clinic, low humidity can lead to dry skin, throat, and sinuses, as well as cause eye irritation. If you or a loved one experiences these symptoms or respiratory illnesses in the winter, you may want to consider purchasing a ventless fireplace or vent-free gas logs.

An Ideal Level of Humidity

The Association of Home Appliance Manufacturers, the trade association for the humidifier industry, recommends a 60% indoor relative humidity. Water vapors in your home come from a variety of sources, such as dishwashers, ranges, and showers. To improve the level of comfort and reduce symptoms like sore throat and nasal dryness, many people add humidification with either a portable or whole-house system.

Keep in mind that a home is not airtight. Even one built to the tightest construction standards allowed by codes still has at least 0.35 air exchanges per hour. This means the higher-humidity indoor air is constantly being replaced by lower-humidity outdoor air. You’ve probably noticed cold air leaks around the windows and doors in your own home during winter. That’s indicative of air exchange taking place. While vent-free products increase the relative humidity, the air exchange decreases the relative humidity, which can help you achieve and optimum level of humidity in your home.

How Does a Vent-Free Appliance Work in a Tightly Constructed Home?

The answer is very well. It’s simple: A well-constructed home requires less heating, and as a result, the appliance will operate for a shorter period of time and produce less water vapor. Of course, in average homes, particularly those located in the most northern climates, you may notice some condensation on cold surfaces such as the inside of the windows. However, this condition is indicative of the weather and the construction, and would most likely exist whether or not a vent-free appliance is present.

If you’d like to learn more about the benefits of vent-free gas logs and fireplaces, view our FAQs or contact us today!

Debunking Myths: Straight Facts About Ventless Gas Appliances

empire-vent-free-gas-fireplaceAlthough millions of American homeowners commonly use vent-free gas logs, there is still some confusion in the marketplace about these products. Even worse, much of this confusion is based on the dissemination of inaccuracies and misconceptions about ventless products. Fine’s Gas would like to address some of these fallacies and provide you with the facts.

Myth: Vent-free gas appliances cause health problems.
Fact: While some people may have special sensitivity to various household environmental factors, there are no independent, documented studies that show vent-free products cause illness or negative health effects. On the other hand, a thorough, well-documented independent study has been conducted on the effects of vent-free gas product emissions. The study concluded that vent-free gas logs performed well within all nationally recognized guidelines for indoor air quality.

Myth: Carbon monoxide (CO) emissions from vent-free gas logs may be an issue, especially in households with children, pregnant women, and elderly people.
Fact: The effects of vent-free gas logs emissions on sensitive populations have been tested extensively. Researchers used the recommended maximum levels of CO as set by the Consumer Product Safety Commission (CPSC) with sensitive populations, such as children, pregnant women, and the elderly, as the benchmark. The results of the research proved that vent-free gas heating products performed well within the CPSC guidelines for carbon monoxide and all other indoor air quality guidelines by OSHA, NIOSH and ASHRAE.

Myth: There is no standard that regulates the safety of vent-free logs.
Fact: Vent-free gas logs conform to the national product safety standard, ANSI Z21.11.2. This standard mandates many construction and performance requirements that, among others, include tests for proper combustion under abnormal conditions. All vent-free gas products sold in the U.S. are certified by recognized listing agencies for compliance with this ANSI standard to assure their safety and performance.

Myth: There is nothing to prevent a thrifty homeowner from using ventless gas logs as a sole heat source.
Fact: All major building codes categorize vent-free gas logs for supplemental use and require that a primary source of heat (e.g., a furnace) be present in the home before a ventless product can be installed. It is clearly stated in the operating instructions of every vent-free appliance that they be used only for supplemental heating.

Myth: There are many places where vent-free gas logs are not accepted for use.
Fact: Currently, the vast majority of states in the U.S. allow for the sale and installation of vent-free supplemental gas heat appliances. International Mechanical Code (IMC), the National Fuel Gas Code, and most other codes in the U.S. allow for vent-free appliances. Unfortunately, the Uniform Mechanical Code (UMC) does not permit the use of ventless products; however, many localities are now adopting the IMC over the UMC, and therefore, allowing the use of vent-free products.

Myth: Vent-free gas logs produce too much heat in tightly constructed homes.
Fact: The heat output of properly sized vent-free products can be easily controlled by the homeowner and set to the desired comfort level. However, installers of vent-free gas logs in homes that have extremely tight construction should be sure to follow the manufacturer’s instructions and building code requirements for supplying ventilation and combustion air. In some cases, additional mechanical ventilation may need to be added before installing a vent-free gas heating appliance.

Myth: Ceiling fans should not be installed in rooms with vent-free fireplaces.
Fact: Ceiling fans may be used to help distribute the heat. However, fans should not be allowed to blow directly into the fireplace to avoid any drafts that alter burner flame patterns, which can result in sooting.

Myth: All vent-free appliances have inputs of as much as 40,000 BTU of heat, but most rooms need only 5,000 to 15,000.
Fact: Nearly all ventless gas logs have manual or thermostatic controls that let the homeowner adjust the input rating to the preferred level of heating (e.g., low to high). Vent-free appliances come in a variety of sizes, ranging from inputs of 8,000 BTU to a maximum of 40,000 BTU. Smaller units are available for bathrooms (2,000 to 6,000 BTU) and bedrooms (10,000 BTU). Manufacturers provide clear sizing guidelines with their products.

Have additional questions about vent-free gas logs and fireplaces? View our FAQ pages, or contact our team today!