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Hi TopCat - Thanks for choosing GE! The charcoal filter is only required for recirculating (non-vented). If your microwave is vented outdoors, the charcoal filter is not necessary. It is included if outdoor venting is not an option. The over-the-range models are all designed for adaptation for the following three types of ventilation: 1. Outside Exhaust (Vertical – Delivered from factory in vertical position). 2. Outside Exhaust (Horizontal). 3. Recirculating (Non-vented ductless). Keep in touch at GEAppliances.com. Sue
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