Hi, that's a good question. The answer is yes definitely but it can be a expensive to do in some cases.
But in most instances you can buy an insert that has all the gas equipment needed to work with your existing firebox.
The best thing to do is see whats available locally at a fireplace store or check with an LP or natural gas company and they will show you what they have available;-)
In any case, I will stick with you until this is complete.
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