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It's Dick
a secondary vent is a vent or tube that connects to the secondary cone for the lava to flow.
The purpose of the vent on the furnace is to ventilate flue gases out side of the house.
It is important that you KEEP THE FIREPLACE VENT DAMPER OPEN when you are using it. FAILURE TO DO SO CAN LEAD TO CARBON MONOXIDE POISONING AND DEATH.
Is this an insert into a previous wood burning fireplace? Direct vent or vent free? BTUs?