| 摘要 |
A filter screen structure includes a filter screen having air vents distributed thereon, and one or more layers of impedance material attached to the filter screen to increase an impedance of the filter screen and reduce the speed of air flowing through the filter screen. Through proper attachment of the impedance material to the filter screen in predetermined manners, the speed of air flown through the filter screen may be effectively adjusted to thereby regulate the volume of air flown through the filter screen.
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