What is a Duct Blaster Test?

A duct blaster test is used to measure air leakage in a home’s HVAC duct system. At Green Thinking, LLC, we perform this test by sealing off the registers and using specialized equipment to depressurize the ductwork. This allows us to detect and quantify how much air is escaping through unsealed joints, loose connections, or gaps in the system- especially in ducts located in unconditioned spaces like attics, garages, or crawlspaces.

This test is required by the IECC energy code when ductwork runs outside the conditioned envelope and is essential for verifying HVAC system integrity during new construction, renovations, or energy audits.

Why Duct Blaster Testing Matters:

- Code Compliance: IECC requires duct leakage testing in most new homes with ducts in unconditioned space
- HVAC System Performance: Leaky ducts reduce system efficiency, increase runtime, and limit airflow
- Indoor Air Quality: Return-side leaks can pull in dust, insulation particles, or moisture from outside the living space
- Comfort & Energy Use: Duct leaks lead to uneven room temperatures, hot/cold spots, and higher utility bills

In Summary:

Leaky ductwork compromises HVAC efficiency, increases energy costs, and shortens the life of your mechanical system. It also puts your home’s comfort, air quality, and long-term performance at risk.

That’s why duct blaster testing must be performed by a certified professional. At Green Thinking, LLC, testing is conducted by a RESNET HERS Rater and BPI Certified Building Analyst, delivering accurate results and clear guidance to help both builders and homeowners meet code, protect their investment, and ensure lasting home performance.