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Venting for metal melting furnace
I have been working on installation plans for my Johnson Furnace metal melting furnace that I posted about awhile ago. The previous ower used garden hose to supply natural gas to it.
What I am struggling with is how to vent it. I'm not worried about the heat it creates I'm more concerned with the fumes generated during the melting process. The manufacturer's recommendation is to have 200 cfm of airflow at the base of the vent hood and that it should be 1' wider than the furnace on each side. What I am trying to figure out is what type of fan to use to vent the combustion gasses. I am planning on using Class A flue to go from the hood through the roof mostly because I am not sure how to determine the temperature of the gasses to vented. I belong to a couple of foundry groups on facebook and they didn't have many suggestions because they move their furnaces outside when they use them. Since this is a commercial model it really needs to be permanently installed and it's too heavy to move around.
I realize that this out of the ordinary but suggestions would be welcomed.