If the SMH9187 venting is set up properly, the powerful 400 cfm exhaust fan should draw air from the cooktop effectively. Please review the instructions in the installation guide to ensure the blower is set up properly to vent inside. Installation instructions can be downloaded as a pdf file through this link: http://ars.samsung.com/customer/usa...
. Please note that these instructions are the same for all Samsung over the range microwaves, and are not specific to any one model, though it is important to confirm the blower is angled appropriately for your desired venting.
If, after reviewing the installation, you continue to have an issue with your exhaust fan, please call 800-SAMSUNG to speak with an agent who will be happy to assist you further.