No. Dryer ducts are there to carry out moisture laden air,
not to vent the heat, although they do that in the process.
They are not like a furnace flue which is designed to vent the
heat and fumes generated by the furnace.
As a side note, I would run a good quality dryer vent. Hard
duct or pipe, not flex. If you must run flex, then run hard
pipe for the straight runs and use flex where it is necessary,
and only use aluminum flex, not plastic. Do not use plastic
anywhere. You may find that hard pipe is cheaper than flex,
anyway. The reason that I say this is because it will prevent
crimps in the dryer duct and ensure a good vent for your
dryer. Easier to clean without damaging the vent, also.
If you have good ducting surrounded by insulation, you have no
problem. If you have crimped or dirty ducts or damaged ducts
surrounded by insulation, you will have problems. Possibly
fire, if lint has been allowed to build up to a dangerous
level, but mostly humidity which is damaging to almost everything.
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