Move the dryer away from the wall, if necessary, to gain access to the metal venting. Locate the screws on top of each metal clamp joining the vent sections together. The precise number of sections depends on the distance your dryer is installed from an exterior wall. There are usually at least three pieces.
Loosen the screw of each clamp and pull the sections of the vent apart, including the pieces at the back of the dryer and the exhaust hood. Set the pieces to one side ready for cleaning.
Vacuum out each section and brush away any build up of lint or dust on the walls of the vent. Push the pieces of the vent back together and tighten the clamps to restore the dryer for use.
Run the dryer on empty and place a hand over the exhaust pipe outside your home. You should feel a steady stream of air if the vent is clear and working properly. Remember to clean the dryer's lint screen at the start or end of each cycle.