What type of gases do traps prevent from entering buildings?

Traps are plumbing devices designed to retain a small amount of water, creating a seal that prevents gases from entering a building's interior. The main purpose of these traps is to block sewer gases, which can contain harmful substances, unpleasant odors, and pathogens from the sewer system. Sewer gases, which may include hydrogen sulfide, ammonia, and methane, can pose serious health risks if allowed to escape into living spaces.

While carbon monoxide is a toxic gas that can result from incomplete combustion, traps specifically do not function to prevent its entry; rather, it is controlled by proper ventilation and exhaust systems associated with combustion appliances. Natural gases, primarily methane, are managed by gas lines and inbuilt safety mechanisms, not by traps. Pesticide gases are unrelated to plumbing traps as these are typically linked to agricultural or pest control practices rather than sewer systems. Therefore, traps are specifically designed to prevent sewer gases from infiltrating buildings, ensuring a safe and pleasant indoor environment.