What Is Building Airtightness? And Why It Matters

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Building airtightness measures how much air leaks through a closed building. The less leakage, the less energy wasted. We test it with a blower door — a fan that creates ±50 Pa pressure difference and measures how much air escapes. The result is the air change rate (n50): Ultra-low energy buildings: n50 ≤ 0.6 ACH Conventional buildings: n50 = 3–10 ACH That's a 5–15x difference. More leakage means more heat loss. Improving airtightness is one of the most cost-effective ways to cut energy demand. ? Watch the video to learn more.

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