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As for vent speeds. See "controls" under "specs" on the best buy site, it says 2 fan speeds which I would guess is incorrect for 400cfm.
Sorry, there was a problem. Please try again later.Great question, Lacouyon! In researching, we were able to see that this microwave is designed for adaptation to the following three types of ventilation: Outside top exhaust (Vertical Duct), outside back exhaust (Horizontal Duct), and recirculating (Non-Vented Ductless). We were also able to see the Exhaust fan speeds are listed as follows 3 Speeds - 400CFM/Med/105CFM/Off. We certainly hope this information was helpful to you and answers your question. -Ciara
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