A question for anyone with a very small utility room/cupboard or knowledge in this area. What is the smallest space I can fit a stacked washing machine and tumble dryer in please? I am particularly concerned with minimising the depth to give me space elsewhere. Is 15cm behind the machines enough? Can I get away with less? I'm hoping that the depth of the room doesn't need to be more than 80cm. Also will it be okay without ventilation? (it will be a heat pump tumble dryer)