A  type  of  lock  having  an  inside  release  bar.  When  depressed,  the  release  bar  (called  crossbar,  push  pad,  etc.)  retracts  the  latch  bolt,  thus  permitting  the  door  to  be  opened.  Most  codes  require  that  the  activating  portion  of  the  release  mechanism  extend  not  less  than  half  way  across  the  door.  A  dogging  device  allows  the  release  bar  to  be  locked  down  so  that  the  latch  bolt  remains  retracted  and  the  door  can  be  used  as  a  "push-pull"  door.  They  may  or  may  not  be  key  operated  from  the  outside.  These  devices  have  been  investigated  for  panic  and  are  listed  by  a  nationally  recognized  independent  testing  laboratory  and  are  also  under  in-plant  follow-up  inspection  service.  They  may  not  be  used  on  fire  doors.

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