Many Range Hoods feature the option to recirculate the captured air rather than having to go to the expense and hassle of setting up a ducting system throughout the kitchen. This is especially useful when it comes to situations where space or routing problems may occur. Using a ductless or recirculating system makes it easy to have a great looking range hood without the hassle of construction issues. Charcoal filters can be used in these systems and can be changed out periodically when necessary.