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The answer can vary widely based on a home's age and design. As with any type of remodeling project, assume that every structure is load-bearing until confirming otherwise with a structural engineer. Almost all modern homes have chimneys that are fully independent from the rest of the home's framing. As a result, they don't bear any load beyond their own weight. However, many historic homes built prior to the 1900s contain load-bearing chimneys that tie into the surrounding roof and floor joists. If possible, use a home's blueprints or look for chimney connections that indicate load-bearing qualities to get your answer.

The primary disadvantage of a ventless fireplace is that it doesn’t have an exterior venting system. This means that the byproducts from combustion are emitted into your home, which raises some safety concerns. In addition, ventless gas fireplaces produce moisture as they burn—and if there’s no ventilation, you could end up with a mold problem.

You should get your chimney cleaned around once per year, but you might want to opt for bi-annual cleanings if you use your fireplace often. Remember, your boiler likely vents into your chimney as well, so cleaning is required even if you don’t use your fireplace. It’s a good idea to clean your chimney during the summer so that it’s ready to use when you want a worry-free cozy fire on that first crisp autumn night of the season.

There are a few things you can keep an eye out for that indicate you may need to call in a gas fireplace repair tech:

• Your fireplace pilot light won’t stay on.

• You notice the smell of rotten eggs.

• You hear hissing coming from the gas fireplace.

• You notice a soot build-up.

• The fire goes out unexpectedly.

If you notice a rotten egg smell or hear hissing, you could have a gas leak, which is extremely dangerous. Call the fire department and your gas company first to shut off the gas and air out your home before calling for a repair.