Measuring airtightness quickly and easily
With the A(ir)T(ightness)T(ester), the air density of buildings can be measured quickly and easily. The ATT makes clever use of the ventilation system. The pressure vessel of the ATT serves as a reference (pressure in the house when the ventilation system is off). While the ventilation system is switched on and off several times, the pressure difference compared to the reference is measured. The air density (e.g. Qv10) is calculated from this pressure difference and the ventilation air flow rate. Whereas in larger construction projects the blower door is often used to take a random sample, with the ATT the airtightness of all dwellings can be tested in an easy and accessible way.