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The extractor fan has butterfly back draught shutters that clip into the back of the spigot. The two wings are held in place by one spring as shown in the pictures. On receipt it will be at the factory setting of 15 minutes.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.