Hello, janice.
Thank you for bringing this to our attention. We appreciate you letting us know your inquiry on the CFM of this Samsung microwave and if you can vent it up and outside. We understand that this information may be essential for you. We're here to help.
As per checking, it has 400 CFM, and this microwave oven is compatible with the following three types of ventilation:
A. Outside Top Exhaust (Vertical Duct)
B. Recirculating (Non-Vented Ductless)
C. Outside Back Exhaust (Horizontal Duct)
For reference, attached is a link to the installation guide that you can check. See pages 11-14 for the ventilation types and how to do it.
https://downloadcenter.samsung.com/content/EM/202202/20220223182321209/SMH1927_XAA_DE68-04108A-07_EN_220120.pdf
For other concerns, do not hesitate to reach out via our Support Channels below:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.commuity.samsung.com/t5/Samsung-Community/ct-p/us
Thank you, and stay safe!
Your Reference Ticket Number: 1144289541
-Angelica