2021 International Mechanical Code (IMC), ICC Paperback

2021 International Mechanical Code (IMC), paperback

The 2021 International Mechanical Code sets minimum regulations for mechanical systems using prescriptive and performance-related provisions. It is written on broad principles so that new materials, methods and designs can be approved.

HVAC contractors, mechanical engineers, plans examiners and mechanical inspectors use the IMC for ventilation, exhaust systems, ductwork, combustion air, chimneys and refrigeration. This listing is the 2021 edition, ISBN 9781609839642.

Changes in the 2021 IMC

• Clothes dryer exhaust terminals must be at least 3 feet from any opening into a building.
• Spray-applied polyurethane foam on the outside of ducts in attics and crawl spaces must meet smoke and flame index limits.
• Fire and smoke dampers need approved access for inspection and maintenance.
• Refrigerant tables now list newer refrigerants.
• Condensate terminations need identification markings, with new discharge restrictions.
• Approved factory-built combination intake and exhaust terminations relax the separation requirement.
• Whole-house balanced ventilation systems may use 30 percent less minimum mechanical ventilation.
• Manicure and pedicure station exhaust must run continuously.
• Grease ducts need a horizontal cleanout within 3 feet of a horizontal discharge fan.

Book details

• Title: 2021 International Mechanical Code (IMC)
• Edition: 2021
• Publisher: International Code Council (ICC)
• ISBN-13: 9781609839642
• Format: Paperback

Questions buyers ask

What is the International Mechanical Code?

It is ICC's model code for mechanical systems in buildings, covering HVAC, ventilation, exhaust, duct systems, chimneys and refrigeration.

How far must a dryer vent terminate from an opening under the 2021 IMC?

The 2021 IMC requires clothes dryer exhaust terminals to be at least 3 feet from any opening into the building.

Is the 2021 IMC the newest edition?

No, the 2024 IMC is newer. Buy the 2021 edition if your jurisdiction or exam still references it.

Does the IMC include fuel gas rules?

Fuel gas piping and gas appliances are covered by the International Fuel Gas Code. We sell the 2021 IMC and IFGC together as a set.

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