Which fixtures typically require venting according to the plumbing code?

Venting is a critical aspect of plumbing systems as it allows for the proper functioning of drainage by maintaining neutral air pressure within the pipes. According to the National Plumbing Code of Canada, all fixtures connected to the drainage system require venting. This includes fixtures such as sinks, toilets, dishwashers, showers, and more.

The purpose of venting is to allow the escape of sewer gases, prevent the siphoning of water out of traps, and promote the smooth flow of wastewater. Each type of fixture generates specific flows and pressures, necessitating proper vent configurations to ensure that the drainage system operates effectively and safely.

By stating that all fixtures require venting, the code recognizes that each contributes to the overall drainage system and the need for effective venting to avoid issues such as slow drains, sewer gas odors, or complete blockage. Venting becomes especially important in systems where multiple fixtures are in close proximity, ensuring that one fixture's operation does not adversely affect another.

Thus, the idea that only specific fixtures or none at all require venting (as presented in the other options) does not align with the comprehensive requirements established in the plumbing code. Proper venting is essential for all connected fixtures to maintain a healthy and functional plumbing system.