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I did not measure the vent opening at the back of the microwave. I have attached a picture of the installation template for a rear venting opening. It shows 12 inches x 4 inches. Note on doing the rear venting.....since you need to make sure that the template is in the middle of the space under the cabinet....the vent hole in the wall might hit a stud...if you don't have any vent hole yet...have it professionally done....our builder made the vent hole smaller to avoid cutting the stud..thus the vent hole is smaller than 12 inches. good luck
Sorry, there was a problem. Please try again later.Hi Vent, Thank you for reaching out and we hope you are in good health. We appreciate your interest in Samsung home appliances, specifically with Samsung - 1.1 cu. ft. Smart SLIM Over-the-Range Microwave with 550 CFM Hood Ventilation, Wi-Fi & Voice Control - Stainless steel. The measurements are either 6 inches round or 3 ¼ inches x 10 inches rectangular. I have shared the installation guide link below. Please access the link and turn to pages 4 - 5. https://downloadcenter.samsung.com/content/EM/202202/20220223181502042/Install_ME11A7510DS_AA_DE68-04709A-01_EN-MES_220120.pdf Please feel free to communicate with us through the channels below if you have additional questions. 1. Facebook Messenger: http://m.me/samsungsupport 2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513 3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us Your reference number: 1144439275 Leo
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