As long as there is combustion, the flue should be left open.
The open position for a chimney flue is typically when it is fully vertical or parallel to the ground, allowing smoke and gases to escape. The closed position is usually when the flue damper is in a horizontal or perpendicular position, blocking off the chimney to prevent drafts and heat loss when the fireplace is not in use.
When the fire is burning, until the ashes are cold. The damper should be open at these times.
In process plant environment, SO3 gas is mixed into flue gas from combustion to make the ashes charged up before flowing through electrostatic precipitators. The electrostatic precipitators will then trap the ashes, making cleaner process emission possible.
"The flue on the chimney was closed, causing smoke to move out into the room." "Damaging fires can occur when unburned material called creosote accumulates on the metal flue and in the upper chimney."
By flue, I believe you mean the damper in the chimney, which has the effect of closing off the flue. Close the damper any time you are not using the fireplace. Remember -heat rises -so heated air will also rise up and out the flue in the winter. In the summer it is also good to keep the flue closed because heat and humidity will activate the smelly properties of the ash and creosote in the firepalce chimney and create a bad odor in the home. In order for a damper to do its job it must seal tightly/ If your existing mechanical damper is broken, missing or in a bad state you can repair it or replace it with a chimney top damper or a chimney balloon. But, open the damper before lighting a a fire, or it will rapidly get quite smokey in the house.
A flue gas Desulphurisation (FGD) plant removes Sulphur Dioxide from the flue gas before it is released into the atmosphere and hence reduces our impact on the environment.
This handle would be for emptying ashes that fall below the grate i would think.
Clogged chimney, closed flue, or wind blowing into the fireplace.
NO. a flue should never be closed when a fire is lit. It is the way poisonous gases like carbon monoxide are taken out of a room,hallway or any enclosed space. flues can be closed only when a fire is not being used,to keep out draughts on windy days.
if it is instaled corectly, the handle which controlls the flue goes in the same direction as the plate inside the chimney. so if the handle is horizontal, the flue is closed. if the handle is verticle, the flue is open. you shouldn't have to close the flue all the way, at most it should be at a 60degree angle to allow smoke to leave, while retaining heat. open the flue all the way when you open the door to the stove so that the smoke will go out the chimney and not into your face and house. but close the flue back down some to keep in the heat and not waste firewood warmth on the air outside.
At the beginning of fall, before you build a fire in your fireplace make sure to open the chimney's flue.
It's important that an indoor fireplace flue damper be opened before igniting anything in a fireplace. The damper looks similar to a trap door and is located at the bottom of the chimney. When it's open, it provides an opening for smoke from the fireplace to escape. If it is closed while a fire is lit, smoke will enter the room rather than leave via the chimney with possible deadly consequences. If nothing is burning in the fireplace, keep the flue damper closed. This saves money on energy by preventing heat or air conditioning loss up through the chimney.