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

### Instruction:
Which Particulate size approaching 100% retention has a Usage of semi hepa and a Class of h12?

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

### Response:
SELECT Particulate size approaching 100% retention FROM table WHERE Usage = semi hepa AND Class = h12