Now autumn's arrived and the leaves are falling from the trees, you might notice that your ventilation fan starts to make humming / vibrating sounds when it's on 3 or 4. This is because leaves get sucked into the inlet of the fan and get stuck in the fan blades. Here's how to get them out. You will need a Torx screwdriver (3mm, I think) and about 10 minutes to do this job: First, turn on the fan, and set it to re-circ. Once the re-circ's come on and the fan starts to blow harder, turn off t