Yes. If there is no recorded leakage over the last 12 months, you must use 0.5% for the Lr value, which represents the low-end of the allowable range. However, if the equipment is under separate management control (e.g. a refrigerator owned by a tenant), you may use the 10% exemption to exclude that equipment from the credit requirements (up to 10% of the building floor area can be excluded if it is under separate management control).