Well, while we don't exactly have the weather for it, I came across this map online that shows you where and how much a ventless fireplace is allowed. I won't ruin the surprise for you, so check it out for yourself!
http://www.ventless-gas-fireplaces.com/ventless_products_code_information.html
http://www.ventless-gas-fireplaces.com/ventless_products_code_information.html
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