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Have you considered using a fan with motorized louvres or iris to stop draughts when not in use?The diameter of the blades is 130mm and as you may see from the image, there is a plastic film attached blocking off incoming air. Fitted on a north facing wall, the kitchen was so cold in the winter months that I decided to remove the fuse and block off incoming air. We will do the same with the new unit. However, should we decide to downsize then the new unit will be recommissioned ready for any survey.View attachment 268153