A:Answer Hi CE,
I agree with you that when the microwave is configured to vent out, it will not recirculate and vise-versa. We are dishearted to know that the microwave isn't working as intended.
One reason why air still comes out the front if the microwave was configured to vent is with the blower. The blower might be configured for recirculating even if there are vents installed on the microwave to exhaust outside.
Please refer to pages 12 - 14 of the installation guide I have shared below to check if the blower is properly configured to vent outside.
https://downloadcenter.samsung.com/content/EM/202202/20220223182321209/SMH1927_XAA_DE68-04108A-07_EN_220120.pdf
Should you need more assistance, please feel free to get back to us via the following options:
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When you message us, provide them this number 1144913036 and it will help our team pull up your information.
Leo