2021 International Mechanical Code®

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Soft Cover

Item #: 3300S21

$99.50
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25-49 $94.53
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100 and up $84.58
$74.50
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50-99 $67.05
100 and up $63.33
$25.00
Loose Leaf

Item #: 3300L21

$117.00
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50-99 $105.30
100 and up $99.45
$88.00
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25-49 $83.60
50-99 $79.20
100 and up $74.80
$29.00
Soft Cover & PDF/Redline Download

Item #: 3300SPR21

$131.00
$98.00
$33.00
Loose Leaf & PDF/Redline Download

Item #: 3300LPR21

$142.00
$107.00
$35.00
PDF/Redline Download

Item #: 8730PR21

$87.00
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2 $65.25
3-4 $60.90
5-9 $52.20
10 and up $47.85
$65.25
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2 $48.94
3-4 $45.68
5-9 $39.15
10 and up $35.89
$21.75

Establishes minimum regulations for mechanical systems using prescriptive and performance-related provisions. The IMC was developed with broad-based principles that make possible the use of new materials, methods and design.

Important changes in the 2021 IMC® include:

  • Clothes dryer exhaust terminals required to be at least 3 feet from any opening into a building.
  • Polyurethane spray-applied foam on the exterior of ducts in attics and crawl spaces required to meet specific smoke and flame index limits.
  • Fire and smoke dampers must be provided with approved access for inspection and maintenance.
  • Refrigerant tables updated to include new refrigerants.
  • Addition of condensate termination identification markings and discharge restrictions.
  • Approved factory-built combination intake/exhaust terminations permitted, relaxing separation requirement.
  • 30% reduction in minimum mechanical ventilation for whole-house balanced ventilation systems.
  • Continuous operation requirement for manicure and pedicure station exhaust systems.
  • Grease duct horizontal cleanout required within 3 feet of a horizontal discharge fan.
More Information
Description: Links

Front Matter (Title Page, TOC, Preface and Forward)

Referenced Standards

Pages 186
Code Year 2021
ISBN 978-1-60983-964-2 (soft cover edition) / 978-1-60983-968-9 (loose leaf edition)
Publisher ICC

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