Professional Blower Door Testing Services
Measure building airtightness, identify air leakage, verify code compliance, and make informed decisions about energy efficiency, comfort, and indoor air quality.
What Is a Blower Door Test?
A blower door test measures the airtightness of a building by depressurizing or pressurizing the structure with a powerful calibrated fan.
By measuring the airflow required to maintain a specific pressure difference, we can pinpoint draft sources, evaluate overall building tightness, and help ensure optimal energy efficiency and indoor air quality.
Blower Door Testing for Every Stage of a Building
From new construction compliance to diagnostic testing of existing homes, blower door testing provides measurable information about the performance of the building envelope.
Code Compliance Testing
Most modern building codes, such as IECC N1102.4.1.2, require verified air tightness performance prior to occupancy.
SBC Testing provides certified final blower door testing and documentation to help ensure your project meets or exceeds applicable local building energy codes.
Prior to leaving your new construction site, you will be provided with the documentation needed for the code-compliant test. SBC Testing generally produces a code-compliant RESNET 380 test report for the code enforcement office.
View the referenced building code ↗Mid-Construction Air Control Layer Testing
Conducted before drywall is installed, mid-construction testing allows builders to verify the continuity of the air barrier.
Identifying and sealing leaks at this stage can save significant time and rework costs later in the project.
Energy Efficiency & Diagnostic Testing
Ideal for existing homes experiencing high utility bills, room-to-room draftiness, or moisture issues.
When paired with thermal imaging and smoke testing, blower door testing can help locate hidden air leakage so air-sealing and insulation improvements can be targeted effectively.
Multi-Fan Testing for Large & Commercial Buildings
Large structures and multi-family buildings require specialized equipment capable of moving greater volumes of air.
Using coordinated multi-fan systems, SBC Testing can depressurize large footprints or conduct compartmentation testing between individual dwelling units.
Blower Door Testing in Practice
A look at testing equipment and projects completed by SBC Testing.
Blower Door Testing Videos
See examples of SBC Testing's building-performance testing and diagnostic work.
Let's Talk About Your Project.
Whether you need code-compliance documentation, mid-construction testing, or help diagnosing an existing building, SBC Testing can help determine the right approach.
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