A handy tool to compare the ATTMA standard to ISO 9972:2012 technical standard.
| ATTMA TSL1 | ISO 9972:2012 | |
|---|---|---|
| Intended Building Type | Residences & Large Buildings | Single-zone buildings |
| Recommended Test Conditions | <6m/s wind height x ∆T < 250 m°C | Wind at Ground < 3 m/s Wind at Station < 6 m/s Wind < 3 on Beaufort Scale ∆T x Height < 250 m°K |
| Baseline Pressure Measurement | 30 second averages; before and after flow measurements | Over 30 seconds at least 10 separate readings; before and after flow measurements |
| Maximum zero-flow pressure (all readings) | < +/- 5 Pascals | < +/- 5 Pascals |
| Maximum zero-flow pressure (all -negative readings) | < -5 Pascals | < -5 Pascals |
| Maximum zero-flow pressure (all +positive readings) | < +5 Pascals | < +5 Pascals |
| Lowest minimum test pressure | 10 Pa; or 5 times the zero-flow pressure | 10 Pa; or 5 times the zero-flow pressure |
| Lowest maximum test pressure | 50 Pascals; 55 Pa suggested | 50 Pascals |
| Minimum spread of test pressures from low to high | 30 Pa | 30 Pa |
| Example range of Test Pressure Differences | 10 to 60 Pa | 10 to 60 Pa |
| Number of Test Points & Duration | 7 | > 5 (duration not provided) |
| Space between data points | 10 Pa suggested | 10 Pa suggested |
| Preferred Test Direction | Both | Both |
| Acceptable Test Direction | Either or Both | Either or Both |
| Required calculations | C, n for both pressurization and depressurization | C, n for both pressurization and depressurization |
| Acceptable Range: n | 0.50 ≤ n ≤ 1.00 | 0.50 ≤ n ≤ 1.00 |
| Acceptable Range: r2 | r² > 0.98 | r² > 0.98 |
| Other | Indicates that a check of single-zone conditions should be performed to ensure that the interior pressure differs by no greater than 10% of the measured test pressure. | Indicates that a check of single-zone conditions should be performed to ensure that the interior pressure differs by no greater than 10% of the measured test pressure. |
| Reporting Metric(s) | permeability preferred (m 3/ h)/ m2 | several |
| Equipment Precision | +/- 7% airflow | +/- 7% airflow |