1622 E MARINE VIEW DR BUILDING J 2022-08-29

O L Q V i D A Riverview J I WSEC Air Barrier Testing Report Table 2:Comprehensive Test Results-(Positive and Negative Pressure) With Confidence Intervals Parameter Low Mid. High Limit Test Total Leakage @ 75 Pa 0.244 CFM/ft2 0.245 CFM/ft2 0.246 CFM/ft2 < 0.25 CFM/ft2 PASS Pressure Exponent,n 0.625 0.635 0.645 0.45<n<0.85 PASS Leakage Coefficient,Co 1,650 1,719 1,787 ELA @ 75 Pa 12.137 ft2 12.207 ft2 12.277 ft2 ASTM E779-15 Test Procedure ASTM E779-15 defines a power-law model relating differential pressure across a building envelope (dP) induced by fans with the corresponding airflow(Q)through an orifice with a leakage coefficient Cand pressure exponent n: Q= C(dP)" Ideally, a test consists of pressurizing and depressurizing a building with fans at differential pressures from 30 Pa to 75 Pa. Zero-airflow measurements before and after the test adjust measured dP to correct for any bias pressures detected (Wind,stack effect, etc). Pressurization airflow measurements Q are converted to volumetric standard airflows Qo of the inside air by correcting for temperature and barometric pressure. Likewise, depressurization test measurements are corrected for outside air temperature and pressure. Measured pressure differences are averaged, and airflows for fans running simultaneously are summed. An unweighted regression estimates the model parameters C and n based on converted volumetric airflows Qo. The leakage coefficient Cis"corrected"and renamed to Co to adjust for standard reference conditions:sea-level pressure and a 68 degrees Fahrenheit temperature. The pressure exponent n is a measure of air turbulence, and must fall within a small limit to ensure model validity according to regulations. The regression's correlation coefficient r2 must be sufficiently close to 1.0 to indicate a proper agreement between the measured data and the power-law model: Qo=Co(dP)" Standard volumetric airflow estimates Qo can now be computed for any given dP and compared to other building sites given the leakage coefficient correction Co. Soloveda follows the E779-15 guidelines both for computing small sample-size confidence intervals using the T- distribution, and for combining parameters and their confidence intervals from pressurization and depressurization data. 3 I 8