DUST FILTER COMPARTMENT ON A DML DRILL HAD BEEN OPENED BY DRILL OPERATOR FOR A MAINTENANCE CHECK OF FILTERS. AFTER COMPLETION OF MINOR ADJUSTMENTS, DRILLER RESTARTED DUST CONTROL SYSTEM FAN B EFORE CLOSING FILTER COMPARTMENT DOORS, CREATINGA STRONG VACUUM IN THE FILTER COMPARTMENT. INJURED WAS ASSISTING IN CLOSING THE FILTER COMPARTMENT.