Serves as an air inlet in houses with Tunnel or Combi-Tunnel ventilation.
This tunnel inlet can be mounted directly in interior walls or sandwich panels and is equipped with semi-insulated inlet flaps made from PVC.
1 Used for air direction/speed/air volume control
2 Designed for livestock house with less wall space clearance
3 Available with transparent lap or insulated flap
4 Airtight when closed
5 Reduced building and fitting costs, maintenance free
| Specification | size（WxH） | Size for installation |
| A type | 1145x1155mm | 1050x1060mm |
| B type | 1295x1325mm | 1200x1230mm |
