Ah, I finally see that the pipe actually exits the fireplace on the other side. At first I thought this was an extreme way to give the fire more air.<br><br>Fireplaces are very inefficient, and most actually cool the house. It is hard to get folks to realize that all that air going up the chimney is pulling an equal amount of cold air from outside through doors, windows, cracks, etc. I like anything that helps pull a bit more heat into the room (piping, deflectors, inserts, etc.)<br><br> How noisy is that fan?
u shaped pipes running under the fire and over head will draw air without a blower/fan

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