4IN std Fan (Vortice) No Timer? Suitable for wall or window installation.? For intermittent extract of shower rooms, en suites, w.c's.? Not suitable for ducting up to roof tile vents.? Not suitable for flat ducting.? IPX4 splash proof protection on all models. If installing in ceiling need additional gasket to maintain IPX4 protection.? Automatic Shutter models can be window fitted by use of the Punto Window Kit.? The standard models can be speed regulated.? Timer models are adjustable from 3 to 20 minutes.