Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Class has a Performance test of minimum value, and a Usage of semi hepa, and a Performance of 99.5%?

### Inputs:
table_name: table, columns: ['Usage', 'Class', 'Performance', 'Performance test', 'Particulate size approaching 100% retention', 'Test Standard']

### Response:
SELECT Class FROM table WHERE Performance test = minimum value AND Usage = semi hepa AND Performance = 99.5%