▁is ▁una ware ▁there ▁is ▁a ▁door ▁at ▁all . ▁This ▁risk ▁may ▁be ▁particularly ▁pron ounced ▁with ▁sl iding ▁glass ▁doors ▁because ▁they ▁often ▁have ▁large ▁single ▁pan es ▁which ▁are ▁hard ▁to ▁see . ▁To ▁prevent ▁injury ▁from ▁glass ▁doors , ▁stick ers ▁or ▁other ▁types ▁of ▁warnings ▁are ▁sometimes ▁placed ▁on ▁the ▁glass ▁surface ▁to ▁make ▁it ▁more ▁visible . ▁For ▁instance , ▁in ▁the ▁UK , ▁Reg ulation ▁ 1 4 ▁of ▁the ▁Work place ▁( He alth ▁and ▁Saf ety ▁Reg ulations ) ▁ 1 9 9 2 ▁requires ▁the ▁mark ing ▁of ▁windows ▁and ▁glass ▁doors ▁to ▁make ▁them ▁consp ic uous . ▁Australian ▁Stand ards : ▁AS 1 2 8 8 ▁and ▁AS 2 2 0 8 ▁require ▁glass ▁doors ▁to ▁be ▁made ▁from ▁l amin ated , ▁temper ed ▁or ▁t ough ened ▁glass . ▁ ▁Fire ▁▁ ▁Special ▁purpose ▁fire ▁doors ▁are ▁often ▁employed ▁in ▁buildings ▁to ▁reduce ▁the ▁overall ▁risk ▁of ▁fire , ▁particularly ▁by ▁prevent ing ▁the ▁spread ▁of ▁fire ▁and ▁smoke . ▁In ▁cases ▁where ▁they ▁are ▁impro per ly ▁installed , ▁employed , ▁or ▁tam per ed ▁with , ▁the ▁risk ▁of ▁fire ▁can ▁be ▁increased . ▁Do or ▁clos ers ▁are ▁sometimes ▁used ▁to ▁ensure ▁fire ▁doors ▁remain ▁closed . ▁ ▁An ▁additional ▁risk ▁in ▁a ▁fire ▁is ▁that ▁doors ▁may ▁prevent ▁access ▁to ▁emer gency ▁services ▁personnel ▁in ▁order ▁to ▁fight ▁the ▁fire , ▁rescue ▁occup ants , ▁etc . ▁Do or ▁bre aching ▁techniques ▁may ▁be ▁required