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Oh dryer vents.... I do not have a code book with me at the moment but here goes.
1 the overall length of dryer vent is 25' if memory serves. Reduce by 5' for each 90 degree turn.
2 DO NOT use PVC for venting. Static electricity builds up in PVC and then you've got a source of ignition for the lint.
3 The only place you can use a UL listed flex is between the dryer and hard pipe.
4 Use hard pipe held together with UL listed foil tape 181 P to make your connections.
5 Booster fans are not listed by UL as far as I know... yes the motors are listed but the fans not that I remember.
6 Back to the 25' thing... most dryer manufacturers have spec's that go greater than the minimum 25'
I would recommend keeping the run as short as possible for several reasons. Gas dryers are a ton hotter than electric ones, the length of run has alot to do with why the current set up is dropping lint in the piping.
Best of luck and if you need more info pm me
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