4 Pa test (detailed procedure) with a leakage tester
It must be ensured at all times that sufficient combustion air is supplied to the fireplace. If, for example, an extractor fan is operated at the same time, excessive negative pressure may build up in the room, causing exhaust gas to back up.
For the safe operation of fireplaces, the maximum negative pressure must not exceed 4 Pa (8 Pa for room air-dependent fireplaces). The 4 Pa test can be used to measure whether there is sufficient combustion air. The 4 Pa test can be carried out using either the simplified or the detailed procedure. The measurement test to verify that there is a sufficient supply of combustion air is carried out in the following cases:
Non-compliance with the combustion air supply for room-air-independent fireplaces
Troubleshooting (e.g. exhaust gas backflow)
Simultaneous operation of fireplaces and extractor hoods
In the detailed procedure, the leak tester is connected to the exhaust system instead of the fireplace so that the combustion air requirement of the fireplace is simulated.
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