§ Chapter 16 IRC 2024
Duct Systems
8 entries from Chapter 16 of IRC 2024, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.
§ 01 Sections
All 8 entries.
Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.
Section
Title
Question
M1401
IRC 2024 Air Handler Installation: Drain Pan, Condensate Line, and Access Requirements
M1401
What does IRC 2024 require for air handler installation in an attic, including drain pan, condensate line slope, and working clearances?
What does IRC 2024 require for air handler installation in an attic, including drain pan, condensate line slope, and working clearances?
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M1601.1
IRC 2024 Dryer Duct vs HVAC Duct: Why They Cannot Share the Same Ductwork
M1601.1
Can a clothes dryer share ductwork with the HVAC system, and what does IRC 2024 say about dryer duct separation?
Can a clothes dryer share ductwork with the HVAC system, and what does IRC 2024 say about dryer duct separation?
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M1601.1
IRC 2024 Flex Duct Installation: Length Limits and Support Requirements
M1601.1
What are the IRC 2024 rules for flexible duct installation, including maximum length, bend limits, and support spacing?
What are the IRC 2024 rules for flexible duct installation, including maximum length, bend limits, and support spacing?
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M1601.1
IRC 2024 Supply Air Grille Placement: Under Windows and Exterior Walls for Comfort
M1601.1
Where does IRC 2024 require supply air registers to be placed, and why does perimeter placement matter for comfort?
Where does IRC 2024 require supply air registers to be placed, and why does perimeter placement matter for comfort?
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M1601.3
IRC 2024 Duct Insulation: R-6 Minimum for Ducts in Unconditioned Spaces
M1601.3
What insulation R-value does IRC 2024 require for HVAC ducts in attics, crawl spaces, and other unconditioned areas?
What insulation R-value does IRC 2024 require for HVAC ducts in attics, crawl spaces, and other unconditioned areas?
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M1601.4
IRC 2024 Duct Sealing: Mastic or Listed Tape Required at All Joints
M1601.4
What does IRC 2024 require for sealing duct joints and seams, and is regular duct tape acceptable?
What does IRC 2024 require for sealing duct joints and seams, and is regular duct tape acceptable?
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M1602
IRC 2024 Return Air: Minimum Return Capacity and Door Undercut Rules
M1602
What does IRC 2024 require for return air capacity, and how must return air be provided to closed rooms?
What does IRC 2024 require for return air capacity, and how must return air be provided to closed rooms?
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M1602.2
IRC 2024 HVAC Ducts in Garage: Prohibited Return Air and Fire Separation Rules
M1602.2
What does IRC 2024 require for HVAC ductwork that runs through or is located in an attached garage?
What does IRC 2024 require for HVAC ductwork that runs through or is located in an attached garage?
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