Hello - hope someone can help me. I have a Vent Axia Extractor Fan in a downstairs loo that needs either cleaning or replacing. I can remove the outer cover (with the logo) by sliding it to the right. When I remove the screw in the attached picture from the next cover and insert a small screw driver in the small hole to the left, the cover only releases in the corner close to the hole. There are no others holes on any other sides but the cover stays attached. I did contact Vent Axia, they told me to remove the cover (that I cannot remove) to locate the model number ... helpful! Thanks for any help. Steven