Union Officials. Except as hereinafter provided, Union business shall be conducted by Union officials on off-duty hours. Designated Union officials shall be permitted to have time off without loss of pay for the investigation and processing of grievances and arbitrations. Grievants shall be permitted to have time off without loss of pay for processing their grievance through the contractual grievance procedure, except that for class action grievances, no more than three (3) grievants shall be granted such leave. Requests for all such time off shall be made in advance and shall not be unreasonably denied. Union officials and representatives shall conduct Union business in a manner which shall not be disruptive to the Employer’s operations or any employee's work. The Union will furnish the Employer with a list of the designated Union officials.