Infiltration and Duct Leakage (Course) - American Institute of Building Science

Infiltration and Duct Leakage (IDL)

Reduce Air Loss. Improve Comfort. Increase Efficiency.

The Infiltration and Duct Leakage (IDL) course prepares professionals to measure, analyze, and correct uncontrolled air leakage in residential buildings. This course emphasizes proper diagnostic testing, accurate data collection, and effective mitigation strategies to improve energy efficiency, indoor comfort, and building durability.

The IDL course combines classroom instruction with hands-on field application focused on air infiltration and duct system performance.

Standards & Compliance

BPI Technical Standards overview Program-specific testing requirements Documentation and reporting best practices

Duct System Diagnostics

Duct leakage measurement techniques Supply and return system assessment Pressure pan testing basics Identifying inefficient duct designs

Mitigation & Repair Strategies

Sealing methods for envelope and ductwork Material selection and installation best practices Safety and combustion appliance considerations

Building Envelope Airflow Fundamentals

Understanding infiltration in homes Pressure relationships and stack effect Air barrier continuity Thermal boundary considerations

Blower Door Testing

Whole-house air leakage measurement Test setup and calibration Data interpretation and reporting Identifying and prioritizing leakage sites

Prerequisite: Foundational knowledge in building science, or prior certification in BPI Building Science Principles or equivalent.

The goal of the IDL course is to:

Develop professionals capable of accurately measuring, analyzing, and reducing uncontrolled air and duct leakage in residential buildings, improving energy performance, occupant comfort, and safety.

Upon certification, participants will be able to:

Conduct blower door testing and interpret results
Measure duct leakage accurately
Identify critical air leakage paths
Recommend and implement effective sealing solutions
Produce professional, standards-compliant documentation

Why Train With American Institute of Building Science?

At the American Institute of Building Science, our mission is to elevate industry standards through high-quality education, hands-on training, and real-world application.

We equip professionals with the knowledge and confidence to deliver measurable performance improvements in every project.

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