| http://www.w3.org/ns/prov#value | - rential pressure gauge 24 and from the anemometer 25 are supplied to the control unit 26. [0100] If a failure such as a breakage has occurred in the sealant used to seal the joints between the panels of the chamber wall defining the negative pressure area in the chamber 9, then an opening may be formed in the sealant by such breakage and the ambient air may be drawn into the chamber through the op
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