This vent blows the exhaust air up rather than straight out the back of the Roomba 650 (May fit on others as well, not sure). Before, it kicks up a dust storm just with its exhaust, but with this, alot stays on the ground to be vacuumed up!Disclaimer: This may, like most prints, need a little filing and finagling to get it fit as desired. But, easier to file away areas than to add material to it. Also, fits the Series 500, but they had to hot glue it in. Not sure how to get it not to need hot glue...