Can anyone tell me for sure what type of fireplace i have? It is masonry built and the chimney is on the outside of the house. The firebox has brick as you can see below but I do have vents on each corner of the fireplace with a switch to turn on a blower or fan. Would this be a heatform type fireplace or is it possible when the fireplace was built they just added a blower around the firebox behind the brick?