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Does anyone remember the Ameri-therm vent damper? These were a mechanical device that consisted of a stainless steel housing and four quadrants of a bi-metal inside. When the hot flu gases from the furnace or hot water heater reached the bi-metal the flu opened and allowed the gases up the chimney. Since there was no permissive between the appliance and the vent damper this always seemed questionable to me.
1. Are these dampers still made?
2. Are they still legal or restricted by code?
3. Does anyone know of a problem with one where a fatality occured?
4. If you seen one on a furnace you serviced what would you do?
5. How about on a hot water heater that you did not service?