Drain Venting Lesson 1 - Vent Fundamentals

This video teaches the fundamental principles of drain-waste-vent (DWV) plumbing venting, covering why airflow is required for drains to work, code rules for vent termination, dry vent slope and connection angles, trap arm length limits, and vent slope-back requirements. 🔧 Want more from Plumber Tom? Create your FREE GritWorks Plumbing account for plumbing training, ad free videos, practice exams, and more. Free to join. No credit card required. 👉 https://GritWorksPlumbing.com Chapters: 00:00 - Intro 01:52 - Principle 1 Airflow Required 02:42 - Principle 2 Vents Terminate Outdoors 03:32 - Principle 3 Dry Vent Runs Vertical 04:19 - Principle 4 Trap Arm Length Limits 05:10 - Principle 5 Vent Slope Back To Drain 06:08 - Individual Vents Explained 07:53 - Crown Vents 09:03 - Common Vents 11:19 - Common Vent Violations 11:47 - Lesson Recap It's aimed at plumbing apprentices and state exam candidates who need to understand individual vents, crown vents, and common vents, including common code violations to avoid. Plumber Tom walks through diagrams comparing correct and incorrect vent installations for fixtures like lavatories, toilets, and tub/shower combos.