Turn the gas cook-top's knobs counterclockwise to the off position. Wait at least one hour for the grates and grille to cool.
Place oven mitts on your hands, and lift the vent grille from the middle of the cook-top. Set it aside. With the grille removed, the vent gasket, vent filter and vent chamber are visible.
Pull out the vent gasket. The gasket is directly underneath the location from which you removed the vent grille.
Lift the vent filter from inside the gas cook-top's vent chamber. The vent chamber is below the cook-top's surface, inside the appliance. The vent filter is a wire screen.
Grab the left and right side of the GE Profile cook-top, and slowly lift the cook-top from its counter opening to access the inside of the counter. Avoid lifting the cook-top by its vent chamber because doing so can break the cook-top and void its warranty.