Vent Axia VA100XHT 251510B  4 inch 100mm axial bathroom / toilet fan. Best deal online at only £86.99 

With integral auto humidity control, integral overrun timer, (3-20 mins) automatic shutter and neon running light.

Extract performance is an impressive 90 cubic metres per hour (25 litres per second)

Ceiling or panel mounting, fit to a wall using appropriate ducting and exterior grille.

Suitable for ambient temperatures up to +40°C.

Fitted with Standard Thermal Overload Protection (S.T.O.P).