Ca s e s t udy 706 Power pl ant r equi r es v ent i l at i on s y s t em The i nc r eas i ng popul ar i t y of hy dr oel ec t r i c i t y as a r enewabl e ener gy s our c e has l ed t o a l ar ge number of power pl ant s openi ng i n r ec ent y ear s . So when an ex i s t i ng power f ac i l i t y r equi r ed r enov at i on of a l ar ge t unnel on i t s s i t e, appr opr i at e ai r c i r c ul at i on was es s ent i al bef or e wor k c oul d

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