A microwave which is designed to be mounted over the cooktop usually has equipped with some ventilation system.
Built in microwave ventilation.
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Adjust it so each vent area has at least 1 inch of space in front of it.
Furthermore the over the range microwave with vent may recirculate air back to the kitchen or may lead to an exterior vent.
This article describes the venting options for built in microwave ovens and microwave oven vent systems typically installed above a stovetop or range.
Built in microwaves look so much nicer than countertop or over the range microwaves because they are designed to fit into cabinetry rather than stick out like a sore thumb.
A built in 2 speed 300 cfm venting system helps enhance the air quality of your kitchen by removing smoke steam and odors from your cooktop.
Do not push the microwave all the way against the back panel of the cabinet and do not force the microwave into the cabinet space if the side panels do not provide enough space for the vents.
This is to manage with smoke cooking odours and the moisture that rises while cooking.