Site assessment

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Carrying equipment

A Pulse system using only one air receiver is designed to be carried by a single person, utilising the built-in shoulder straps.

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Check wind conditions

When first arriving on site, you should measure and record the wind speed to verify that it is within the tolerance required to produce reliable results. In breezy conditions or exposed locations, the pressure within the building can be affected by strong winds, which may compromise test accuracy. To produce a valid result, tests should only be done at wind speeds below 6 m/s (around 13 mph). Testing in higher wind speeds is possible but requires a greater level of caution and is generally not recommended.

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Air receiver capacity

If we assume an air permeability of 5m³/h.m² at 50 Pa, a single Pulse air receiver has enough capacity to sufficiently pressurise a building of approximately 150m² total floor area, 350m² envelope area or 350m³ volume. Larger or leakier buildings can still be tested by adding more air receivers. A maximum of 10 air receivers are supported in total. Refer to using multiple air receivers for more information on how to connect additional air receivers. Similarly, smaller buildings may require the air receivers to be charged to a lower pressure to avoid overpressurising. The table below is provided purely for guidance only and estimates the number of air receivers and initial charge pressure required in various types of typical UK housing stock. The actual number of air receivers required will depend on the size of the building, its age and leakiness.