The range hood above your stove or stovetop performs the important function of pulling air contaminated with smoke, grease, moisture and certain chemicals out of your kitchen air if you are using a gas range. Many range hoods use ducts to send the air outdoors, but some recirculate it back into the kitchen after extensively filtering it.
Unlike an island range hood or a wall-mount range hood, an insert range hood is not inclusive to the entire ventilation system. It can be installed in a custom range hood venting system so that you can achieve the look and function that you want. Much like an under-cabinet range hood, a vent hood insert is often installed into the cabinetry above the range.
Choosing the best range hood insert is about picking the right size and power. The power of a range hood is expressed in CFM or cubic feet per minute. Many factors impact the CFM rating you need, including whether you have a gas range or an electric range and the BTUs from a gas appliance.