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Thanks Jase I appreciate your help. Is your existing duct 100 or 125mm? Only some appear to be 125.... I was considering changing it for an electric 100mm fan (mains), but didn't measure the existing one.

Hi Jase, I have just come across one, in a bathroom. Taking the cover off, it appears to be a simple bi-metallic strip that mechanically activates the shutters!! How easy ! Of course, my customer has asked for a replacement cover, or a new unit altogether (im the sparky) and can I hella's like...