| 摘要 |
A filter bag of rectangular shape is fitted over the computer to be protected. It has a main opening for receiving the computer, and is longer than the computer with the open-ended position extended beyond the computer and tied to close the main opening against the passage of air therethrough. After fitting the bag over the computer, a piece of the bag is cut to form an inner flap, and this flap with an outer flap remains hingedly secured to the bag, in register with a hole in the computer. The flap is momentarily opened for providing access to the computer and closed, and when closed provides an almost perfect seal.
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