On 02/03/2018 13:14, Bingo wrote:
replying to David W.E. Roberts, Bingo wrote:
The bathroom one is on a timer switch, the kitchen one you turn on and off
manually! Simple!

A timer is only relevant for an internal bathroom where you have to turn
the light on to use it - the fan comes on and stays on for five minutes
or so after you leave. For a bathroom with a window you want one that
you turn on manually, preferably a two speed job so you can leave it on
low (and quiet) most of the time and only turn it to full (and noisy)
when required. Suus cuique crepitus bene olet.

--
Max Demian