Key Takeaways
Set Clear Testing Targets
Building air-tightness targets: ≤ 3 or 5 ACH50 depending on the code.
Duct leakage limits: ≤ 8 CFM25 per 100 ft² for total, and ≤ 4 CFM25 per 100 ft² for duct leakage to outdoors.
Use the Right Tools & Techniques
A calibrated DucTester fan paired with a DM‑2/DM‑32 gauge ensures accurate readings using Set Pressure and @Pressure modes.
Simple physical rules of thumb—like starting at depressurization and sealing registers—help hit targets fast.
Repeatable Setup = Reliable Results
Following step-by-step guides (like Retrotec’s QuickGuide) consistently delivers test setups that reproduce under 10% variance.
Modular procedures—seal, connect, select range, control pressure, record flow, verify—drive simplicity.
Real Results, Fast
- With proper sealing and setup, most residential duct systems pass on the first try.
- The DM gauge’s extrapolation features mean you don’t even have to reach exact test pressure—yet still get valid readings.
Why It Works So Well
Precision Equipment: Calibrated fans and gauges give confidence in measurement accuracy.
Built-in Support: Clear visual guidance (QuickGuide and webinars) reduces user error.
Techical Shortcuts: Features like @Pressure shave time while maintaining code compliance.
Codes Aligned: Results map directly to well-known standards like RESNET, IECC, and ENERGY STAR
