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Hi goldfinch, thank you for reaching out. No, an opening measuring 27" W × 17" H × 20 3/4" D is not compatible with the GMBS3068BF built-in microwave and its required trim kit, as a larger cabinet opening is needed for proper installation. Additionally, no external exhaust vent is required. The microwave is designed to vent through the openings provided by the compatible trim kit, so no outside ducting is necessary. — Reed
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