The Simply Silent CV4S Fan from Xpelair is a low voltage two speed, constant volume fan with an intermittent hour-run on timer which is suitable for wall, ceiling, window and panel mounting. This low voltage fan is specifically designed to be installed directly in or over the spalsh area zone (zone 1). The fan is supplied complete with a 12V SELV transformer to be sited out of reach of any person using the bath or shower. This Simply Silent fan incorporates Ghost Airflow Technology which offers all of the following benefits.               Flow straighteners guide air through ducting which reduces turbulence, smoothing and making the air flow laminar.     A cone reduces turbulence in front of the fan and air is directed straight into the impellor     Ball-bearing motors suppress noise from the motor For ease of installation               Strengthened ducting reduces duct distortion on fitting and avoids breakage     Radial screw slots for easy alignment of batk place prior to final fixing     Features a level line at bottom of back plate for ease of alignment     Large cable access for ease of wiring     Backplate has only three screws not four - thus saving 25% of time at installation     Front cover is easy to remove or replace     To replace  - hook at top, rotate, press and clip back into place     Notch to remove cover with tool - no screws     Easy cleaning thanks to twist and turn baffle It is finished in white and boasts a modern discreet design which will complement even the most exacting decor and environmental requirements. The fan is IPX4 rated and meets Building Regulations Part F.