IRC 2021 · Model

Chapter 16: Duct Systems

12 sections in this chapter of the IRC 2021 model text — not Model's amended edition.

1601.4 Installation Duct installation shall comply with Sections M1601.4.1 through M1601.4.10.

  1. 1601.4Installation
  2. M1601.1Duct design
  3. M1601.1.1Above-ground duct systems
  4. M1601.1.2Underground duct systems
  5. M1601.2Vibration isolators
  6. M1601.3Duct insulation materials
  7. M1601.4Duct materials
  8. M1601.4.1Joints, seams and connections
  9. M1601.5Under-floor plenums
  10. M1601.6Independent garage HVAC systems
  11. M1602.1Outdoor air openings
  12. M1602.2Return air openings

The full text is for BuildSpec members

Read the complete section, search across every adopted code, run the calculators and ask Copilot — free for 14 days, no card required.

  • Full text of every section in this chapter
  • Plain-English summaries and cross-references
  • Compare this chapter across jurisdictions
  • Ask Code AI about any section, with citations
Start your free 14-day trialSign in →

No card required. After the 14-day trial, plans start at $29/mo.

Our previews are real data — live counts, no placeholders. We publish our error log →

IRC 2021 Chapter 16: Duct Systems — Model Code | BuildSpec