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UL has 7 listings total. https://iq.ulprospector.com/en/_?p=10005,10048,10006,10047&qm=q:dryer exhaust duct power ventilatorsLast time I checked, there were no listed booster fans...….the motors are the problem, so I have been told.
this one is listed with Inertek, another ICC approved testing company
https://hw.menardc.com/main/items/media/BODOR001/Prod_Tech_Spec/DryerBoosterVKPSSpecSheet.pdf
All this and only for elec.dryrers.