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F. LONSTRIiCT]ON ANO IISE OF 4ENTILATION CONTROLS <br />,. ~~. _ ..` ~•i y ,r. <br />1, Ali ventilation controls such es•stoppings; .overcasts,.doors~~arld <br />~• regulators shall be of suhstaritial construction installed in a work- <br />manlike manner and maintained in the condition to serve the purpose <br />for which they are intended, They will he of incombustible material <br />or fire retardant material, The intent heing to direct air to the <br />sections and working faces, and to separate entries for escapeway <br />purposes, The exposed rood used to wedge a stopping, overcast or <br />undercast does not have to be covered with a Sealant on side oppo- <br />site the sealant application as long as a fire-retardant material is <br />applied, Overcast wing walls may De huilt using metal Kennedy stop- <br />pings or wooden squeeze seal blocks as long as both sides of the <br />wootl are covered with an approved sealant or a fire-retardant mate- <br />rial. <br />2. Permanent stoppings shall be erected between the intake and return <br />aircourse and shall be maintained to and including the third con- <br />necting crosscut outhy the faces of the entries, Permanent dry <br />stacked block stoppings that will exceed two years in life will be <br />sealed on both sides with an HSHA approved construction type seal- <br />ant. my stacked Dlock stoppings with less than two years' life <br />will be sealed on one side with an HSNA approved non-construction <br />type sealant, Metal Kennedy stoppings may be used between the in- <br />take and return in mining areas not to exceed two years, Whenever <br />the third connecting crosscut is broken through, work shall be <br />started on builtlin9 the stopping as soon as possible and shall be <br />continued in a reasonable and diligent manner until completed, Cim- <br />ilarly, whenever a belt move is completed, temporary hrattice shall <br />~• be installed immediately and work shall be started on building the <br />permanent stoppings as soon as possible ono shall be continued in a <br />diligent manner until completed, All permanent hlock stoppings may <br />be sealed on ony one side with an MSHA approved non-construction <br />type sealant for 10 stoppings from the face to allow for final seal- <br />ing with appropriate type sealant of several stoppings at once, <br />3, Metal Kennedy stoppings or dry stacked block stoppings covered with <br />an approved non-construction type sealant on one side may be used <br />between the belt haulageway and intake air courses, The exposed <br />wood used to wedge a Stopping does not have to he covered with seal- <br />ant on the opposite side, Timbers or wood blocks laid longitudinal- <br />ly "skin to skin', and packed with rock dust, may be used in heavy <br />or squeezing areas if the timbers or wood hlncks are covered with an <br />approved sealant, Drawings of the stoppings accompany this plan. <br />Canvas or plastic type hrattice may only be used in rooms with a <br />length of 600 feet or less, <br />4, Equipment doors may be utilized hetween intake, beltline, and return <br />air courses provided that they are designed with incomhustihle mate- <br />rial, <br />5. In panel areas designatetl and apprnveA on the mine map, Kennedy <br />stoppings can he covered with hrattice curtain and the edges sealed <br />. in lieu of other type sealants or tape at panel joints. <br />Initial 1]/O1/R6 <br />