?采用優質工程塑料注塑加工制成，密度大更牢固；

?原材料中加有抗紫外線的原料，抗老化性能強、使用壽命更長久；密封嚴密、開啟 靈活、進風口加有防鳥網網；

?雙排彈簧確保側風窗密封良好

? Made of excellent quality engineering plastic by injection molding, higher density and more firmly.

? With UV resistant additive, air inlet has stronger anti-aging ability, longer service life, better sealing, flexible opening, with anti-bird nets.

? Double springs ensures excellent sealing.