14 Performing the measurement
84
4. Open door/window, wait approx. 30 seconds, zero line must be reached
again.
5. Close door/window, wait approx. 30 seconds, check underpressure, check
clean extraction of the flue gases.
6. Open door/window, wait approx. 30 seconds, zero line must be reached
again.
7. Close door/window, wait approx. 30 seconds, check underpressure, check
clean extraction of the flue gases.
After the measurement, the result can be printed out and evaluated. If the
underpressure in the room where the firing installation(s) is/are set up is
constantly below 4 Pa, or with tested firing installations for solid fuels that are
not dependent on indoor air below the maximum permissible underpressure
specified in the proof of usability (currently 8 Pa in principle), then the safe
simultaneous operation of the firing installation and air extraction system(s) is
possible.
Careful execution of the measurement in accordance with the steps listed above
enables a correct evaluation and rating of the safe operation of the firing
installation(s) and indoor air extraction system(s).
The measurement result represents the evaluation of the current status, taking
into account the devices available for the test and influencing the result
(combustion plants and air extraction system(s)) and the condition of the
building (e.g. windows and doors). A new evaluation is required when there is a
change to the firing installation, to any other devices that have an influence or to
the building.
Repeat checks:
Flawless operation of the instrument, the fine pressure probe and the capillary
hoses must be determined by regular checks once every six months at a
technical test centre of the Guild of Master Chimney Sweeps.
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