A:Answer Thanks for reaching out to us, Joe! 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) to meet your installation needs. We certainly hope this information was helpful to you and answers your question. -Ciara