The internal channels of your vacuum can become dirty with use. They do not need to be cleaned often, but doing so can result in quieter operation as well as less dust in the exhaust of the vacuum.
Start with the canister of your vacuum.
Turn the canister around and locate the latch that secures the outer housing of the canister to the cyclone assembly, and push it upwards.
Now, free the cyclone assembly from the clear, plastic canister housing.
Clean the inside of the cyclone assembly out. Use a cloth to clean; the more dust you can clear the less dust will end up in the exhaust of your vacuum.