the pipes need air to equalize the pressure in the drain line. That's why all residential plumbing fixtures have to be vented ...

Without drain vents, gases build up in plumbing pipes and drains and keep water from flowing freely. This prevents air from leaving the pipes, causing clogs, backups, odors, and other problems.

The moral of the story is, ventilation is important, most especially going into the warmer months of the year. If you don’t ...