Damper
There should be a lever somewhere on the duct near the furnace. If it is open, the lever will be parallel to the duct. If the damper is closed, it will be perpendicular to the duct.
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If the furnace itself is in the attic, the humming is likely caused by electrical components in the furnace--most likely, the blower motor, or else a transformer or relay coil. If the furnace is located elsewhere, the humming may be caused by a damper motor or possibly the air movement itself vibrating a damper or some sheet metal.The HVAC Veteran
A Barometric Damper when used properly will help regulate the draft. This in return will allow for better combustion, longer burns and less fuel to be used. One problem with a Barometric Damper is the chimney will run a little cooler due to the introduction of room air. If the unit isn't being burned correctly, this can cause creosote to accumulate in the chimney. The Barometric Damper and flue must be checked periodically and cleaned when necessary.
If it is a wood burning fireplace- yep.
One would expect to pay thousands of dollars for an outside wood furnace. It depends on what type of material was used to create the furnace and who was selling it.
In the event of fire, the fusible link melts and the shutter gets closed. This helps in blocking the fire from spreading through the duct ----- If you are asking about a damper on a stove or chimney, that is not called a fire damper, but just a damper. There is a link to a question on that below.
yes heating furnace use coal and wood to heat and work.Because you cannot get such high temperature without that .
You can place coal in the furnace, then place any wood on the top slot to burn it to charcoal, or use a wood log on the bottom slot and one at the top and it'll burn that way as well.
A Louvre damper is a flu-gas flow control device, analogous to a Venetian blind, that fits between a furnace's flu gas outlet and its chimney; operation of an external lever causes the slats to rotate up to 90 degrees in unison as the damper moves from fully opened to fully closed and visa versa.
To properly install a wood furnace, make sure you know the requirements. You can find information from different websites and by watching do-it-yourself television shows to help you along.