A simple filter will not take care of the humidity being dumped into
the house, which could lead to a seriously increased risk of mould and
The correct way to do this is to use a heat exchanger. The warm wet
air from the tumble passes through the heat exchanger to the outside,
losing its heat as it does so. Fresh air from outside passes through
the heat exchanger, picking up the heat as it does so, and comes
pre-warmed into the house. But the two currents of air never mix. It's
quite common to do this (along with colelcting waste heat from
bathroom extractor fans and the like) in whole-house ventilation
systems in the UK (althoug such systems are themselves quite rare). As
many homes in the US have ducted warm air it might be more feasible to
make use of this.
Of course, flueing for gas tumble dryers must always comply with local
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