§ Chapter 16 IRC 2018
Duct Systems
7 entries from Chapter 16 of IRC 2018, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.
§ 01 Sections
All 7 entries.
Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.
Section
Title
Question
M1601.1.1
Can Wall Cavities Be Used as Supply Air Ducts? (IRC 2018)
M1601.1.1
Can wall cavities be used as supply air ducts?
Can wall cavities be used as supply air ducts?
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M1601.3
Do HVAC Duct Joints Have to Be Sealed With Mastic or Tape? (IRC 2018)
M1601.3
Do HVAC duct joints have to be sealed with mastic or tape?
Do HVAC duct joints have to be sealed with mastic or tape?
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M1601.3.1
Do Ducts in an Attic or Crawl Space Need Insulation? (IRC 2018)
M1601.3.1
Do ducts in an attic or crawl space need insulation?
Do ducts in an attic or crawl space need insulation?
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M1601.3.2
How Often Do Flexible Ducts Need to Be Supported? (IRC 2018)
M1601.3.2
How often do flexible ducts need to be supported?
How often do flexible ducts need to be supported?
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M1601.3.4
Can HVAC Ducts Be Buried Under a Slab? (IRC 2018)
M1601.3.4
Can HVAC ducts be buried under a slab?
Can HVAC ducts be buried under a slab?
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M1602.2
Can a Furnace Closet Use the Door Louver as Return Air? (IRC 2018)
M1602.2
Can a furnace closet use the door louver as return air?
Can a furnace closet use the door louver as return air?
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M1602.2
Can a Return Air Grille Be in a Garage, Closet, Attic, or Crawl Space? (IRC 2018)
M1602.2
Can a return air grille be in a garage, closet, attic, or crawl space?
Can a return air grille be in a garage, closet, attic, or crawl space?
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