 
         
        | Model | Size (mm) | CMH | I.N.P (Pa) | F.N.P (Pa) | Filter object (μm) | EFF. (%) | Filtration Class | 
| RT-PBC7721 | 595*595*21 | 1500/3000 | <30/70 | <220 | ≥5 | 95% | G4 | 
| RT-PBC5721 | 495*595*21 | 1250/2500 | <30/70 | <220 | ≥5 | 95% | G4 | 
| RT-PBC5521 | 495*495*21 | 1000/2000 | <30/70 | <220 | ≥5 | 95% | G4 | 
| RT-PBC1721 | 295*595*21 | 750/1500 | <30/70 | <220 | ≥5 | 95% | G4 | 
| Remark: customized specification is acceptable. | |||||||