The first alphabet of model is "A",the material is aluminium..The first alphabet of model is "G",the material is galvanized steel.ABL/GBL-series with one side flange can be fixed in the pipe.The butterfly shutter is used to prerent the reverse of airflow.
| Model | Product size | |
| D(mm) | L(mm) | |
| ABL100 / GBL100 | 95 | 52 |
| ABL125 / GBL125 | 120 | 52 |
| ABL150 / GBL150 | 145 | 52 |
Drawing：
