ATTMA TSL1 vs ISO 9972:2012 Comparison

A handy tool to compare the ATTMA standard to ISO 9972:2012 technical standard.

ATTMA TSL1ISO 9972:2012
Intended Building TypeResidences
& 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 Measurement30 second averages; before and after flow measurementsOver 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 pressure10 Pa;
or 5 times the zero-flow pressure
10 Pa;
or 5 times the zero-flow pressure
Lowest maximum test pressure50 Pascals;
55 Pa suggested
50 Pascals
Minimum spread of test pressures from low to high30 Pa30 Pa
Example range of Test Pressure Differences10 to  60 Pa10 to  60 Pa
Number of Test
Points  & Duration
7> 5
(duration not provided)
Space between data points10 Pa suggested10 Pa suggested
Preferred Test
Direction
BothBoth
Acceptable Test
Direction
Either or BothEither or Both
Required calculationsC, n for both pressurization and depressurizationC, n for both pressurization and depressurization
Acceptable Range: n0.50 ≤ n ≤ 1.000.50 ≤ n ≤ 1.00
Acceptable Range: r2r² > 0.98r² > 0.98
OtherIndicates 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