Waterproof ceiling speakers are used in bathrooms, en-suites, steam rooms, wet rooms and in some instances outside under eaves or covered structures.
They are designed to withstand steam and water but should not be submerged completely. The rear of the speaker must be installed somewhere water tight so if installing outside you must have a weathertight roof above.
WATERPROOF CEILING SPEAKER BRANDS
For more intense steam rooms and saunas we would recommend that you look at the Apart range which are designed specifically to handle the high temperature and humidity.
WATERPROOF CEILING SPEAKER SIZES
As per standard ceiling speakers you can get weatherproof ceiling speakers in 6.5" and 8".
It's often harder to find smaller sizes than this though. You'll also find single stereo water resistant speakers which are great for bathrooms where you don't really need two speakers.