Extractor fans are great for getting rid of smells and steam when they're switched on but the rest of the time they are drafty holes in your ceiling.
Seal them up when they aren't in use with a DraftStoppa® - a plastic casing that goes over your extractor fan in the roof cavity. It has a set of balanced shutters, a bit like butterfly wings, which open when the fan is turned on and close automatically when the fan is turned off.
It is a simple but brilliant idea that works to help stop drafts (hence the name).
DraftStoppa’s are available in most large hardware stores and online.
Check out the DraftStoppa website for a list of distributors in your state.
They cost between $25 - $35 each