Does the WM3431HW require external venting for drying?
No, the WM3431HW uses a ventless condensing drying system, so no outside venting is required. It dries from within the drum, and the water extracted from clothes drains through the drum and out the water pump. This makes it ideal for apartments or spaces without an external venting source.
From the official LG WM3431HW Washing Machine manual, page 2
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