All Miele tumble dryers achieve optimum leak-proof values and consequently the highest condensation efficiency class A. This means that only a minimum of moist and warm air is able to escape from the appliance. Models in class B release up to 320 ml more moisture into the room – twice as much as in class A. This leak-proof quality of a dryer ensures protection of your room and furniture, by preventing condensation on walls and moulding.