The 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 ducting.
The S90 range has been in production since the 1990's so the quality and durability of the fan has been proven and has stood the test of time.