| 摘要 |
Two parallel-spaced sheets having complementarily flanged peripheral portions forming edge intake structure and an air pump for exhausting the space between the sheets comprise an open-air fume barrier for disposition broadside between two points to isolate the points ventilatively to the extent necessary, as in preventing gasoline fumes from reaching an open flame but at the same time avoiding as much as possible any disturbance of the air at either of the points; both a specially shaped upright laboratory embodiment and a circularly symmetrical gasoline dispenser model are disclosed.
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