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LAND DEVELOPMENT SERVICES
Letters to Industry
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Technical Bulletin #25-04, 05.14.25
Subject: A2L Refrigerants in One-Family and Two-Family Residential Construction
Summary:
This technical bulletin provides information on the permitting, review, and inspection processes for A2L refrigerants in one-family and two-family residential construction in Fairfax County. The 2021 Virginia Uniform Statewide Building Code (VUSCB), effective Jan. 18, 2025, has added provisions that allow the installation of heating and cooling appliances that utilize A2L refrigerants for human comfort. These provisions can be found in Chapter 14 of the Virginia Residential Code (VRC).
Effective Date:
Immediately.
Background:
The use of A2L refrigerants introduces new safety considerations due to their flammability classification. These requirements ensure proper installation, testing, and labeling to mitigate risks associated with A2L refrigerants. The installation of these refrigerants must comply with applicable codes, applicable standards, and the manufacturer’s installation instructions. Land Development Services has provided the policy below that applies to all proposed installation of equipment using A2L refrigerants.
If you have any questions, please contact Dennis Hart in the Residential Branch of the Building Division at 703-324-4606, TTY 711.
Technical Bulletin 25-04:
https://www.fairfaxcounty.gov/landdevelopment/sites/landdevelopment/files/Assets/documents/25-04-a2l-refrigerants-in-one-family-two-family-residential-construction.pdf
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