I have a Superior Fireplace "Heatform" fireplace that was installed in 1984. The "Heatilator" type airflow through tubes around the firebox worked well up until a year or so ago. Since then the airflow through the system has decreased to almost nothing. With the two fans on a very small amount of air does come through. It appears that something has plugged the system but I cannot see, not that there is much of the system visible, any obstruction. Any ideas as to what has happened to the air flow system?
Airflow Through Superior / Heatform fireplace "Heatilator" tubes
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Nope....both cats still around. However an additional discovery is that with the heatilator fan on I get an airflow up through the "Outside" air vent at the bottom front of the firebox. With a fire burning and the heatilator fan off there is a noticeable airflow through that airvent as one would expect. Apparently the heatilator fan is venting into the outside air intake at some point however in looking at various diagrams I can't figure out where that would occur.
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