Chapter 5 governs how gas appliances discharge combustion products and how venting systems are selected, sized, connected, and terminated.
At a Glance
| Lens | Notes |
|---|---|
| Chapter focus | Chimneys and Vents |
| Why it matters | Chapter 5 governs how gas appliances discharge combustion products and how venting systems are selected, sized, connected, and terminated. |
| In the field | This chapter appears at vent connectors, common vent systems, relining jobs, Category I sizing questions, and direct-vent or mechanical vent installations. |
Core Fundamentals
- Safe venting depends on appliance category, vent type, material, sizing, and installation details working together.
- Replacement appliances often expose old venting systems that no longer match the new appliance.
- You have to think from appliance flue collar all the way to final termination.