1.Mounting plate material: Excellent ABS engineering plastic by injection molding ,anti-corrosion, no deformation.
2. Frame and air door material: Excellent PVC plastic by extrusion molding.
3. Hollow design and add sponge for thermal insulation and good sealing
4. Air door is opened under gravity, flexible opening.
5. Opening system and locking screws stainless steel , long lifespan and no rust.
6. Flexible design, air inlet length can be customized.
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