In the preferred embodiment, the air cowl 44 is constructed of a generally planar, rigid, polymeric panel and has a generally rectangular-shape.
在优选实施例中，空气通风帽44通常由平面硬聚合板构成，并且具有通常的长方形。
The air cowl 44 is not limited to constructions including a general arcuate-shape, being generally planar or to being constructed of a molded, polymeric material.
空气通风帽44不限于被构造为包括通常的弓形，呈通常的平面形或者由模塑聚合物材料构成。
The spacers 56 are not limited to extended generally perpendicularly from the internal face 46, to being integrally molded with the air cowl 44 or to having a generally cylindrical-shape.
间隔件56不限于从内部面46处大致垂直地延伸，以及与空气通风帽44一体模塑成型或者具有通常的圆柱形状。
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