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vent i lat ior~ such that r~~ ~ ai_rx i 1 iar•y fans wi 11 be riecessar•y <br />• ,to improve or supplerner~t mine ver~tilatit~r~. <br />Permanent st~_~ppir~gs will 6e erected betweer~ intake, r•et~_rr•r~, <br />ar~d r~eutr•al airways behind active w~=~r•kir~g secti~~r~s. They <br />will direct ar~d separate intake, r~e~_~tr•al, ar~d r•et~.rr•r~ <br />air•fl~~ws. R11 inactive wor•kir~g areas that are r~~~t being <br />~.rsed f~~r ha~.~lage, travel, air co~_~rses, ~~r• extraction cif coal <br />will be sealed with explosi~~r~-proof seals. Ir. every sealed <br />area, ~_~r~e ~~r• rnr~r•e explosive-pr•_~~~f seals will 6e fitted with <br />a pipe ar~d a valve ire c~r•der• to permit air• sarnpl ir~g grid <br />determine the press~.rre ~m the seals. R11 permanent <br />stc~ppir~gs ar~d seals will be made cif fir•epr•oc~f rnater•ials, <br />s~_ich as cerner~t 61_~cl+.s, cir~der• bl_~cks, ~~r• galvanized steel <br />• ar~d will be cor~str•~.rcted s.. as to rriir~irnrze leakage. <br />~~fernp~~r•ar•y sl:~~ppir~gs will be i_ised ire active w~~r•k.irig areas <br />wt~er•e fr•ey~_rer~t change=_-, ire air• fl _~w may be r~ecessar•y. They <br />will be c~~r~str•~_icted r_~f .j~_rte fabric, ~.rr•ethar~e-c~~ated .ji_ite, <br />plastic, wr•~~~.rght 1~_rrnber• cr~ver•ed with plastir_ or tele~~c~~pir~g <br />sheet metal secti~~r~s. They will be installed s~~ as t_~ <br />rnir~irnize air• leakage. <br />Overcasts will be ~_ised as necessary ar~d will serve as are air• <br />bridge t~-~ allr_~w ~t w~~ air• str•earns t~~ cross wi th~~~.it rnixirig. <br />They will be cc~r~str•~.rcted _~f fir•epror_~f rnater•ials, such as <br />cor~cr•ete ~~r• steel. Where _~r~ly small vol~arnes of air• ar•e <br />i r~vo 1 ved, p 3 pe _~ver•cast s wi 1 1 be c~ ~r~st r•~.rct ed. <br />u <br />~_, ll~ / <br />