Baltimore Energy Code & 2018 IECC Requirements
🔧 Blower Door Test Requirements in Maryland
Maximum Air Leakage Rate: The building must not exceed 3 air changes per hour at 50 pascals (ACH50). This standard applies statewide, including in areas like Westminster, MD, which is in Climate Zone 4A. co.worcester.md.us
Testing Method: The test should be conducted using recognized standards such as ASTM E779 or ASTM E1827. It must be performed after all penetrations of the building thermal envelope are created. A written report of the results, signed by the party conducting the test, should be provided to the building official. Fine Homebuilding
Compliance Pathways: While the prescriptive path requires meeting the 3 ACH50 standard, alternative compliance options may be available, depending on local jurisdiction and specific project conditions.
🏠 Preparing for the Blower Door Test
To ensure your home passes the blower door test:
Seal Gaps and Cracks: Before the test, seal any visible gaps or cracks in the building envelope.
Close All Openings: Ensure all windows and doors are closed during the test.
Turn Off HVAC Systems: Deactivate heating, ventilation, and air conditioning systems to prevent interference with the test results.
Coordinate with Professionals: Work with certified professionals experienced in blower door testing to ensure accurate results.
By adhering to these guidelines, you can help ensure your new home meets Maryland's energy efficiency standards and achieves a passing blower door test result.
