I am an expert.
Disconnect the transition duct from the wall and attach pantyhose.
If you clothes dry in 30 minutes, your vent is clogged.
This is usually the case.
Find where the vent terminates - either through the roof or out the
side of the house - and clean the vent pipe from the inside and out.
A shop van is one of the tools that quite often works, but is not the
Certified Dryer Exhaust Technician
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