I don't know how to estimate the thickness. living room, shiny in the beds, so it turned out to be warm in the living room without turning on the main fan. He did a very good job. When the temperature was above 20 F it was warm in my living room. Below that I would have to turn on the main fan. I expected it to be around 35F so 20 is pretty damn good. The heating bill was about $20-$30 cheaper compared to my neighbors except when the temp dropped below 20, but then it was only about $15 higher. For safety, these fireplace remakes are top drawer. Much safer than a small heater.
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