Are vent free gas fireplaces safe?

Fireplaces emit a variety of potentially toxic substances including carbon dioxide and carbon monoxide. The vent free gas fireplace offers no venting capacity so byproducts released from the fireplace remain in the house. It should be noted that vent free or ventless fireplaces are also available in electric and propane models. Because of its popularity we will focus on the vent free gas fireplace.

With advancements in insulation efficiency and the improved methods in which it is installed and the new technologies applied to the exterior of new homes, today