Love my extended vent. On the bottom of the microwave, there is an area that says push. If you are cooking more than one dish on the stove or have lots of steam coming off, you push gently where it says push. Then the vent panel rolls out about 6 additional inches so you have more vent coverage over the top of the stove. When you don't need it, just push gently until it pops back into place. You can use the vent fans either way with it extended or not extended.