The test pressure must not exceed 1000 Pa for A and B class manufactured ducts or maximum design pressure if less than 1000Pa. For C Class ductworks inlet static pressure can be increased up to 2000 Pa. At test procedure the working pressure can be given preference as test inlet duct pressure.
Min. 10 m² duct surface area can be tested with this test device. Test area must be min. 10% for circular duct systems and must be 20% for rectangular duct systems.
The hygienic duct systems must be completely tested.
If you can not reach the enough test pressure with 50 hz frequency of frequency inverter, it’s meaning you have more leakages. If you reduce the amount of leakages you can easily reach the test pressure.
Generally the flanges, elbows, gaskets, fittings and collectors have the more leakages. For preventing the leakages you have to check the gaskets and apply silicon to the connection points.
Visual detection of leakages are made by smoke generator. If smoke generator model is used than smoke generator user guide has to be read and obeyed to the operating manual. Device is getting extremely hot while working, so it has not been touched with bare hands during working and after use. In the case of respiration the smoke, it can cause respiratory diseases. Smoke liquid consist alcohol and can flare and burn.
Electrical connections have to be grounded to prevent electrical shocks.