Blower door testing is a crucial step in achieving Passive House certification, but sometimes, a standard door setup just isn’t practical. During a recent test, I encountered an interesting challenge: the ultra-tight, high-performance door assemblies were manufactured in such a way that made installing the blower door frame nearly impossible. Instead, I opted to set up my Retrotec blower door in a large operable window—a solution that worked perfectly.
Fortunately, the home’s high-performance windows were designed for easy removal using the proprietary tools supplied by the manufacturer. This allowed us to quickly and cleanly take out a sash, creating an ideal opening for the test. On the same day, builder Allan Hocking conducted a separate test using his Minneapolis blower door in the same window. In the end, we both arrived at exactly the same result—a great confirmation of accuracy!
Key Takeaways from the Test
- Effortless Window Removal – Thanks to the manufacturer’s proprietary tools, removing the window sash was a simple and clean process, making setup easy.
- Consistent Results Across Different Equipment – Comparing my Retrotec blower door with Allan’s Minneapolis system proved that both setups produced identical readings.
- Collaborative Learning – Sharing this experience with Allan was incredibly valuable. We exchanged notes, discussed test methodologies, and learned from each other in real-time.
The Final Outcome
Despite the unconventional window-mounted setup, the test confirmed the home’s airtightness met and exceeded Passive House standards,0.23 ACH50. This experience reinforced the importance of adaptability in high-performance building testing—and how rewarding it is to learn alongside like-minded professionals.