A chimney works by a draught blowing over the top of the chimney pulling the rising warm air out, for this to work when you have a stove, fire or cooker in the room you will need to seal the top and bottom of the chimney off with a register or closure plate. This will focus the chimney's efforts in pulling the gasses from your appliance rather than from the room. Register and closure plates also prevent soot and debris from falling down your chimney and into your room.
Chimneys pull the gasses exuded by a fire, stove or cooker up and out. It achieves this as outside air currents pass over the top of the chimney opening, the rising hot air is less dense than the passing cold air and thus rises through it leaving a negative air pressure in the top of the chimney, this negative pressure encourages the gasses emanating from the stove or fire to rise faster and fill the void left by the gasses leaving the chimney. Thus, a constant pull is established, like a gaseous form of capillary action, barring any irregularities in outside air pressure.
This pull depends largely on the installation of a register and closure plate, sealing the chimney space off from all but the hot vented gasses coming from the stove, fire or cooker. Thus focusing the chimneys pull on purely on these gasses, instead of wasting energy pulling gasses from your interior. Register and closure plates also have the added benefit of preventing soot or debris from falling down your chimney and into your room.
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