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If blocked Pb will stick to the walls of the chamber reducing the life of the Muffle.
This also increases the density of the chamber.
The furnace will then need to use additional power to maintain temperature of
the chamber and will have longer cupelling times. Your muffle chamber will also
last longer if you keep everything clean.
To do this you will need a vent cleaning tool, or a piece of metal or jimmy bar to
ream the vent out. Make sure the vent has been cleaned all the way through,
not just at the front. You may need to shine a torch into the vent to see your
progress.
Regularly change or clean the floor tile along with the bone ash for
collection of spills.
