Greenwood Centrifugal Surface Mounted Bathroom Fan - SF90B control_basic The overrun timer can be

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Greenwood Centrifugal Surface Mounted Bathroom Fan - SF90B control_basic The overrun timer can beThe SF90B Surface mounted fan can be wall or ceiling mounted, It is a single speed, 100mm surface mounted centrifugal fan suitable for duct runs up to 10m long and comes with integral back draught shutter. This is the 'B' model which is a single speed fan operated via a light switch or pull cord. The SF90B replaces the S90B. So if you have a S90B then this fan is its direct replacement and it will fit in the same space as your existing product and