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Hi there. Thank you for sharing your inquiry with us. We understand your inquiry about venting options for your LG over-the-range microwave model MVEL2125F. According to the specifications, this model supports both external (ducted) and recirculating (non-ducted) venting configurations. The exhaust vent is located at the top, allowing you to connect ductwork that directs cooking exhaust to the outside (roof or wall). For external venting, you’ll need to install appropriate ductwork (e.g., 3¼" x 10" rectangular or minimum 6" diameter round) and ensure the total duct length and elbows comply (keep duct runs as short as possible, use a back-draft damper, seal joints, and follow clearance templates). If you prefer recirculating mode, charcoal filters are used, and no external duct is required, though capture efficiency is typically lower than with external venting. https://www.bestbuy.com/site/lg-2-1-cu-ft-over-the-range-smart-microwave-with-sensor-cooking-and-extendavent-2-0-stainless-steel/6508557.p?skuId=6508557 If you need further guidance on planning or performing the vent installation—such as selecting duct size, routing, or template alignment—please send us a private message on Social Media @LGUSSupport and our team will be more than happy to explore possible solutions and ensure a smooth installation. We appreciate your patience and thank you for choosing LG. —Renzo
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