1. It is usually used as air outlet and return air vent, as well as supply air vent.

2. It can be directly used as air outlet.

3. As the return air vent, it is derived from HY-KDB single deflection air grille. There just add an inner frame to make the blade parts into openable door structure. The openable door be opened when the bolt is unlock and it is easy to install, clean filter net, maintain. It can be equipped with HY-KFG air vent filter (HY-KFG-L aluminum net air vent filter, HY-KFG-N nylon net air vent filter).

4. As the supply air vent, it can be equipped with HY-KJT rectangle air control damper (HY-KJT-S hand-operated with handle, HY-KJT-Z hand-operated with axis, HY-KJT-D electric controlled.

5. The blade can be adjusted within angle range 0~180°. It can form different diffuse angle and air supply distance by adjusting different angle combinations of blade.

6. The frame has two types of narrow and wide. In the diagram, the size in the bracket is wide type. Please definitely tell us the type of narrow or wide when you order. Otherwise, it should be manufactured according to the narrow type.

7. The blade can be parallel with the long side, or be vertical with the long side. Please definitely tell us which kind you need. Otherwise, it should be manufactured according to the parallel with the long side.

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