Do you mean on the inside wall? There is already an air brick on the outside wall into the cavity and also a vent at the top of the side wall next to the wardrobe. Can you fit trickle vents to existing UPVC windows?
I have black mould growing on the north facing wall behind my wardrobe and the humidity level is very high 70-80%RH. I am thinking of buying a dehumidifier to reduce the humidity. Would this help?
