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Description

Description

2021 Uniform Mechanical Code (UMC)

Name: 2021 Uniform Mechanical Code
Brand: ACCA
Price: 109.6 USD
Availability: InStock

The 2021 Uniform Mechanical Code (UMC®) provides comprehensive requirements for the installation, inspection, and maintenance of heating, ventilation, cooling, and refrigeration systems. Developed through the ANSI Consensus Process and designated as an American National Standard by the American National Standards Institute (ANSI), the 2021 UMC reflects current practices, technologies, and requirements in the mechanical industry.

The 2021 edition is particularly significant for its provisions addressing low-flammability A2L and B2L refrigerants, including refrigerants with lower Global Warming Potential (GWP). The code incorporates contributions from a broad range of professionals and stakeholders across the built environment.

Key Updates in the 2021 Uniform Mechanical Code

The 2021 UMC includes numerous updates and new requirements, including:

New Appendix F – Geothermal Energy Systems
New guard and rail requirements for equipment and appliance installations on roofs
Updated ventilation requirements for transient and nontransient occupancies
New residential ventilation requirements addressing indoor air quality
Revised requirements for air ducts, including factory-made air ducts and dampers
New provisions for factory-built grease ducts
Updated refrigeration system requirements, including pressure-limiting devices and hydrostatic expansion
Revised sizing requirements for natural gas and propane piping systems
Updated pressure-rating requirements for hydronic piping applications
New requirements for fuel gas piping appliance shutoff valves, test pressure, and overpressure protection
New tube fastener provisions for radiant heating and cooling systems
New requirements for residential compressed natural gas (CNG) fueling systems
New fire-extinguishing equipment and carbon monoxide detection requirements for exhaust systems

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