The filter section (12) and the frame are formed of a nonwoven polymer material, preferably a polyester material.
所述过滤区段（12）和所述框架由非纺织聚合物材料形成，并优选由聚酯材料形成。
The filter section (12) and the frame are formed of a nonwoven polymer material, preferably a polyester material.
所述过滤区段（12）和所述框架由非纺织聚合物材料形成，并优选由聚酯材料形成。
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