What type of exhaust vent is required for the Thin Twin dryer?
A four-inch diameter heavy metal vent is required — do not use plastic or metal foil vent. Rigid metal vent is recommended to prevent crushing and kinking, and the dryer must be exhausted to the outside. Do not exhaust the dryer into a chimney, furnace, attic, crawl space, or any other existing vent. (Page 3)
From the official Whirlpool Thin Twin manual, page 3
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