The first alphabet of model is "A",the material is aluminium..The first alphabet of model is "G",the material is galvanized steel.ABI/GBI-series with two sides flange can be fixed in the middle of pipe.The butterfly shutter is used to prevent the reverse of airflow.
| Model | Product size | |
| D(mm) | L(mm) | |
| ABI100 / GBI100 | 100 | 88 |
| ABI125 / GBI125 | 125 | 88 |
| ABI150 / GBI150 | 150 | 88 |
| ABI200 / GBI200 | 200 | 88 |
Drawing：
