The insurance by this policy shall not be prejudiced by :
any act or omission unknown to or beyond the control of the insured on the part of any tenant occupying or using the premises;
any alteration of occupancy due to transfer of processes or machinery in the premises;
structural alterations and/or repairs, limited to buildings, machinery and plant;
temporary unoccupancy of the premises referred to herein for periods in excess of 30 (thirty) days.
temporary unoccupancy of the premises referred to herein for periods in excess of 30 (thirty) days.
It is understood that notice will be given to the insurers by the insured of any happening coming to their knowledge within 30 (thirty) days and that an appropriate additional premium will be paid from the date thereof if required.