FC-6型吸顶通风窗 FC-6 Ceiling Air Inlet 固定板采用优质ABS工程塑料注塑而成,抗腐蚀、不变形;Mounting plate is made of excellent ABS engineering plastic by injection molding. Anti-corrosion, Non-deformation. 外框和风门均采用优质PVC塑料挤塑制成;采用中空设计,并加有海绵保温层,密封良好;Frame & Air door are made of excellent PVC plastic by extrusion molding. Adopt hollow design, add sponge for thermal insulation and good sealing. 风门采用自垂设计,开启灵活;打开机构、锁紧螺钉均采用不锈钢制成、使用寿命长、不生锈;设计灵活,风窗长度可根据要求任意组装;Air door is opened under gravity.Opening system and locking screws are made of stainless steel, long lifespan and rustless.Flexible design, The length of air inlet can be customized.