Board toilet

Board toilets are built-in rooms with a toilet in vehicles for the use of human defecation.

The small rooms are often provided with at least with a sink, liquid soap and paper towels for hand washing. Except in luxury versions, these kind of toilets are usually small and uncomfortable.

The feces are put in a basin (chemical toilets except on aircraft where a holding tank is utilized) or, on some ships, piped over board. They are found in large aircraft, ships including manned spacecraft, some road vehicles (RVs, coaches) and many passenger train cars.

ituation in aircraft

In commercial aircraft, frequently the doors are folded in a zig-zag manner to save space while opening and closing.

Especially in commercial aircraft where it is unlawful to smoke, board toilets are sometimes used by passengers to smoke without the attention of flight attendants. In the United States it is a federal crime with a high fine if this behavior is revealed. In most modern aircraft, smoke detectors are installed to detect illegal smokers.