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§ Chapter 18 IRC 2018

Chimneys and Vents — Mechanical

8 entries from Chapter 18 of IRC 2018, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.

ED IRC 2018 ED IRC 2021 ED IRC 2024
§ 01   Sections

All 8 entries.

Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.

Does Every Gas Furnace or Water Heater Need a Chimney or Vent? (IRC 2018)
M1801.1
Does every gas furnace or water heater need a chimney or vent?
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Can a Gas Appliance Vent Be Reduced in Size Along Its Length? (IRC 2018)
M1802.1
Can a gas appliance vent be reduced in size along its length?
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How Should a Gas Appliance Vent Connector Be Supported and Sloped? (IRC 2018)
M1803.2
How should a gas appliance vent connector be supported and sloped?
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Can a Single-Wall Vent Connector Pass Through a Wall or Partition? (IRC 2018)
M1803.3
Can a single-wall vent connector pass through a wall or partition?
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What Clearance Is Required Between a Vent Connector and Combustible Materials? (IRC 2018)
M1803.3
What clearance is required between a vent connector and combustible materials?
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What Is the Clearance Required for Type B Vent Through Insulated Ceilings? (IRC 2018)
M1803.3
What is the clearance required for Type B vent through insulated ceilings?
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How High Does a Furnace or Water Heater Vent Have to Terminate Above the Roof? (IRC 2018)
M1804.2.6
How high does a furnace or water heater vent have to terminate above the roof?
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Can a Gas Water Heater Vent Into a Masonry Chimney? (IRC 2018)
M1805.1
Can a gas water heater vent into a masonry chimney?
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§ 02   Chapter navigation