A duct leakage tester is a pressurized measurement system that quantifies air escaping through ductwork seams, connections, and material defects by pressurizing the duct system and measuring air loss rate. These instruments are critical for energy efficiency verification and indoor air quality assurance in modern HVAC installations. Duct leakage testing is required by many building codes and energy standards including ASHRAE 90.1.
Technical Details
Duct leakage testers pressurize ductwork to 25 pascals (0.1 in. w.c.) and measure airflow loss in cfm. Results are often normalized to cfm per 100 square feet of duct surface area for comparison against leakage standards. Most systems include a blower door fan assembly, hose kit, and digital pressure/flow readout. Testing standards require sealing all outlets before pressurizing, making equipment versatile for various duct configurations.
HVAC Applications
Energy code compliance verification, new construction commissioning, retrofit evaluation, and HVAC system performance diagnostics all rely on duct leakage testing. Commercial systems commonly target 6-10% leakage or less.
Practical Significance
Duct leakage measurement directly quantifies energy losses and indoor air quality risks, justifying sealing investments and improving overall system efficiency.