The Wohler USA DP 700 (7135) Air Flow Leakage Tester is designed to verify the airtightness of duct systems and single components, but can also be used to test other enclosures such as air conditioning units, climate chambers, electrical cabinets, and furnaces. The instrument is especially designed for leakage tests according to DIN EN 12599 for test procedures and measurement methods to hand over air conditioning and ventilation systems according to DIN EN 14134 for performance testing and installation checks of residential ventilation systems. The tightness is valued according to the tightness classes of DIN EN 13779, which are identical to DIN EN 12237, 1507, 15727, 13403, 1751, 13180.

The DP 700 can be used to measure both positive and negative pressure and the instrument makes it possible to detect leakages in air ducts, components, and appliances during production or prior to plant acceptance. Leakage tests with the DP 700 make an important contribution to assuring quality during production and installation and, as a consequence, to the energy efficiency of air-conditioning and ventilation systems. The instrument is suitable for tests of lower output performance and can be integrated into the final inspection routine of series production runs.