Simply Silent LV100 round grille fascia 4\" 100mm extract fan with integral over-run timer featuring Ghost Air Movement Technology for quiet running. For use with an external switch or sensor. Is typically connected to the room lighting circuit. Fan continues to work after the fan is switched off. The timer is adjustable at installation from seconds to 30 minutes. Supplied with wall fitting kit comprising of outer grille, telescopic wall tube, gasket and foam strips. Supplied with 12V transformer. Features: Extremely quiet running - only 22dBA@3M at low speed Stylish traditional grille design available in square and round Supplied with wall fitting kit - complete one-box installation solution 2 speeds 15l/s and 21l/s - selectable at install Suitable for wall, ceiling, panel and window fitting Complies with building regulations Part F and L Includes 12V SELV transformer Specifications: Electrical power rating (W): 7.4 / 8.4 Extract performance (FID, M³/h) Max/Min: 54 / 76 Extract performance (FID, l/s) Max/Min: 15 / 21 Sound pressure level db(A)@3m: 22 / 34 Specific Fan Power (SFP) (W/l/s): 0.49 / 0.40 Operation Speeds: 2 UK Guarantee: 2 Years IPX Rating: 4 Timer: Yes Universal Mounting Kit: Yes