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cc, iiia N \\As$a#39;aamp;l UISIAIIII -~AsAp.rv\ =6 z rn QvtAnsaquot;ii i T I Ill 20 _Ap71 spiral of rising ventilation power costs. ... in a modern mechanised heading needs a very large increase in pressure development to move this air along the duct, ... The increase in air flow requirement can be countered by reducing duct leakage by better installation and maintenance, ... Where fans are used in series, some of those fans may be stopped where monitoring systems or inspection shows that it is safe to do so.

Publisher: - 1989

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